http://wiki.bdfserver.com/index.php?action=history&feed=atom&title=Our_Night_SkyOur Night Sky - Revision history2026-05-28T19:53:04ZRevision history for this page on the wikiMediaWiki 1.39.1http://wiki.bdfserver.com/index.php?title=Our_Night_Sky&diff=1655&oldid=prevBferrell: /* Episode 12 The Southern Sky and the Milky Way 100px */2019-04-21T17:23:36Z<p><span dir="auto"><span class="autocomment">Episode 12 The Southern Sky and the Milky Way 100px</span></span></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>A sky tour and of a sky I’ll almost never see. Meh. Not that it isn’t well done, but just not much use to me. First we learn about Crux, the Southern Cross, not to be confused with the false cross. It is on the flags of Australia, New Zealand, Papua New Guinea, and Brazil. Acrux is the brightest star at the bottom of the cross. The coal sack nebula is just south and west of the Cross in the Milky Way.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>A sky tour and of a sky I’ll almost never see. Meh. Not that it isn’t well done, but just not much use to me. First we learn about Crux, the Southern Cross, not to be confused with the false cross. It is on the flags of Australia, New Zealand, Papua New Guinea, and Brazil. Acrux is the brightest star at the bottom of the cross. The coal sack nebula is just south and west of the Cross in the Milky Way.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Alpha Centauri is the third brightest star in the sky, and is in Centaurus, and is 4.36 LY away, and is the closest star system to our Sun, and is a binary. A is a G2 Star just like our sun, and the partner is a K2 cooler star. Also nearby is Proxima Centauri, only 4.22 LY, the closest of all. It also contains the globular Cluster Omega Centauri. Also the galaxy Centaurus A, NGC5128, visible in binoculars with a dark dust plane, but otherwise looks like an elliptical.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Alpha Centauri is the third brightest star in the sky, and is in Centaurus, and is 4.36 LY away, and is the closest star system to our Sun, and is a binary. A is a G2 Star just like our sun, and the partner is a K2 cooler star. Also nearby is Proxima Centauri, only 4.22 LY, the closest of all. It also contains the globular Cluster Omega Centauri. Also the galaxy Centaurus A, NGC5128, visible in binoculars with a dark dust plane, but otherwise looks like an elliptical<ins style="font-weight: bold; text-decoration: none;">. </ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Near the Small Magellanic Cloud is 47 Tuncanae, a globular cluster. In late spring and early summer the large Magallanic cloud are both visible, companion galaxies to our Milky Way. They are both irregular galaxies. The tarantula nebula is also nearby. Canopus, or Alpha Carinae, is in the Argo nearly due south of Sirius and is a rare Class F star. The Carina Nebula is nearby at 75 LY and is 4X larger than the Orion Nebula. In here is Eta Carina, which is a huge and unstable star</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''In this final lecture, travel to the Southern Hemisphere for sky views inaccessible from northern latitudes. Discover the famous Southern Cross, the Large and Small Magellanic Clouds, and a spectacular panorama of the Milky Way&mdash;along with new myths and stories that add a human dimension to our marvelous night sky.''</blockquote></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''In this final lecture, travel to the Southern Hemisphere for sky views inaccessible from northern latitudes. Discover the famous Southern Cross, the Large and Small Magellanic Clouds, and a spectacular panorama of the Milky Way&mdash;along with new myths and stories that add a human dimension to our marvelous night sky.''</blockquote></div></td></tr>
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</table>Bferrellhttp://wiki.bdfserver.com/index.php?title=Our_Night_Sky&diff=1654&oldid=prevBferrell: /* Episode 12 The Southern Sky and the Milky Way 100px */2019-04-21T17:14:44Z<p><span dir="auto"><span class="autocomment">Episode 12 The Southern Sky and the Milky Way 100px</span></span></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Episode 12 The Southern Sky and the Milky Way [[Image:3-stars.png|100px]] ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Episode 12 The Southern Sky and the Milky Way [[Image:3-stars.png|100px]] ==</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Astrology</del>. <del style="font-weight: bold; text-decoration: none;">What more </del>is <del style="font-weight: bold; text-decoration: none;">there </del>to <del style="font-weight: bold; text-decoration: none;">say? </del> <del style="font-weight: bold; text-decoration: none;">It </del>is <del style="font-weight: bold; text-decoration: none;">historically important</del>, and <del style="font-weight: bold; text-decoration: none;">it's interesting that they don't deal </del>with <del style="font-weight: bold; text-decoration: none;">precession</del>, but otherwise<del style="font-weight: bold; text-decoration: none;">? Meh</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">A sky tour and of a sky I’ll almost never see. Meh. Not that it isn’t well done, but just not much use to me. First we learn about Crux, the Southern Cross, not to be confused with the false cross. It is on the flags of Australia, New Zealand, Papua New Guinea, and Brazil. Acrux is the brightest star at the bottom of the cross</ins>. <ins style="font-weight: bold; text-decoration: none;">The coal sack nebula is just south and west of the Cross in the Milky Way.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Alpha Centauri is the third brightest star in the sky, and is in Centaurus, and is 4.36 LY away, and </ins>is <ins style="font-weight: bold; text-decoration: none;">the closest star system </ins>to <ins style="font-weight: bold; text-decoration: none;">our Sun, and is a binary. </ins> <ins style="font-weight: bold; text-decoration: none;">A </ins>is <ins style="font-weight: bold; text-decoration: none;">a G2 Star just like our sun</ins>, and <ins style="font-weight: bold; text-decoration: none;">the partner is a K2 cooler star. Also nearby is Proxima Centauri, only 4.22 LY, the closest of all. It also contains the globular Cluster Omega Centauri. Also the galaxy Centaurus A, NGC5128, visible in binoculars </ins>with <ins style="font-weight: bold; text-decoration: none;">a dark dust plane</ins>, but otherwise <ins style="font-weight: bold; text-decoration: none;">looks like an elliptical</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''In this final lecture, travel to the Southern Hemisphere for sky views inaccessible from northern latitudes. Discover the famous Southern Cross, the Large and Small Magellanic Clouds, and a spectacular panorama of the Milky Way&mdash;along with new myths and stories that add a human dimension to our marvelous night sky.''</blockquote></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''In this final lecture, travel to the Southern Hemisphere for sky views inaccessible from northern latitudes. Discover the famous Southern Cross, the Large and Small Magellanic Clouds, and a spectacular panorama of the Milky Way&mdash;along with new myths and stories that add a human dimension to our marvelous night sky.''</blockquote></div></td></tr>
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</table>Bferrellhttp://wiki.bdfserver.com/index.php?title=Our_Night_Sky&diff=1653&oldid=prevBferrell: /* Episode 11 The Summer Sky 100px */2019-04-21T16:45:19Z<p><span dir="auto"><span class="autocomment">Episode 11 The Summer Sky 100px</span></span></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>At the top of the Summer Triangle is Deneb, 1,425 LY away, a blue super giant 110x the radius and 54,000X more luminous than the Sun and in one night it puts out as much energy as the sun in 300 years. Then we look at Albiero, the most beautiful double in the sky with a 3.1 yellow K giant and 5.1 hot blue B8 star 34 arc seconds apart (pretty far for binaries). Within Hercules is M13, the great globular cluster, about 25,000 LY away 150 LY across, and contains about few hundred thousand stars. Also in Hercules is M92 is another globular cluster in the northern part of the constellations.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>At the top of the Summer Triangle is Deneb, 1,425 LY away, a blue super giant 110x the radius and 54,000X more luminous than the Sun and in one night it puts out as much energy as the sun in 300 years. Then we look at Albiero, the most beautiful double in the sky with a 3.1 yellow K giant and 5.1 hot blue B8 star 34 arc seconds apart (pretty far for binaries). Within Hercules is M13, the great globular cluster, about 25,000 LY away 150 LY across, and contains about few hundred thousand stars. Also in Hercules is M92 is another globular cluster in the northern part of the constellations.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Near Antares in Scorpius is the globular cluster M4, too close to Antares to see with the naked eye. Also in Scorpius are M6 (the Butterfly) and M7 (Ptolemy’s cluster), open clusters. M6 has about 50 stars, M7 appears as a bright knot, and is best viewed with binoculars. Just outside of Scorpius is 18 Scorpii, a star very similar to our Sun, 45.7 LY away.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Ophiuchus is a huge constellations to the north of Scorpius. Nearby is Sagittarius, which is on the plane of the Milky Way, so it is very rich, but it does not rise very high in mid northern latitudes. Here is M8, the Lagoon Nebula, which looks split in half by a lagoon. Just north and west is M20, the Trifid nebula. Also M17 (Omega or Swan) and M16 (Eagle nebula) are here.</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Arching high overhead in the summer sky is the Milky Way, which is the plane of our galaxy seen from the inside. Tour this densely packed region of stars of all types, from dusty regions of star birth to the exquisite shells of dying stars. Here, a useful orienting feature is the Summer Triangle.''</blockquote></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Arching high overhead in the summer sky is the Milky Way, which is the plane of our galaxy seen from the inside. Tour this densely packed region of stars of all types, from dusty regions of star birth to the exquisite shells of dying stars. Here, a useful orienting feature is the Summer Triangle.''</blockquote></div></td></tr>
</table>Bferrellhttp://wiki.bdfserver.com/index.php?title=Our_Night_Sky&diff=1652&oldid=prevBferrell: /* Episode 11 The Summer Sky 100px */2019-04-21T16:32:35Z<p><span dir="auto"><span class="autocomment">Episode 11 The Summer Sky 100px</span></span></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Pretty good, but again, a sky tour. We start by learning how to use Ursa Major to find the Summer Triangle and Vega (and the Northern Cross). Then we learn about Epislon Lyrae, the double double star. Apparently those with excellent vision can detect this is a double star, but with about 100X-125X magnification shows that each star is actually a double. Then ere is the Ring Nebula (M57), which requires a scope, but with 125-200X magnification you can see what looks like a smoke ring. This is a planetary nebula, the final stage of a star, much lower power than a supernova, and this is what we expect to happen to the Sun.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Pretty good, but again, a sky tour. We start by learning how to use Ursa Major to find the Summer Triangle and Vega (and the Northern Cross). Then we learn about Epislon Lyrae, the double double star. Apparently those with excellent vision can detect this is a double star, but with about 100X-125X magnification shows that each star is actually a double. Then ere is the Ring Nebula (M57), which requires a scope, but with 125-200X magnification you can see what looks like a smoke ring. This is a planetary nebula, the final stage of a star, much lower power than a supernova, and this is what we expect to happen to the Sun.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>At the top of the Summer Triangle is Deneb, 1,425 LY away, a blue super giant 110x the radius and 54,000X more luminous than the Sun and in one night it puts out as much energy as the sun in 300 years. Then we look at Albiero, the most beautiful double in the sky with a 3.1 yellow K giant and 5.1 hot blue B8 star 34 arc seconds apart (pretty far for binaries).</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>At the top of the Summer Triangle is Deneb, 1,425 LY away, a blue super giant 110x the radius and 54,000X more luminous than the Sun and in one night it puts out as much energy as the sun in 300 years. Then we look at Albiero, the most beautiful double in the sky with a 3.1 yellow K giant and 5.1 hot blue B8 star 34 arc seconds apart (pretty far for binaries)<ins style="font-weight: bold; text-decoration: none;">. Within Hercules is M13, the great globular cluster, about 25,000 LY away 150 LY across, and contains about few hundred thousand stars. Also in Hercules is M92 is another globular cluster in the northern part of the constellations</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Arching high overhead in the summer sky is the Milky Way, which is the plane of our galaxy seen from the inside. Tour this densely packed region of stars of all types, from dusty regions of star birth to the exquisite shells of dying stars. Here, a useful orienting feature is the Summer Triangle.''</blockquote></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Arching high overhead in the summer sky is the Milky Way, which is the plane of our galaxy seen from the inside. Tour this densely packed region of stars of all types, from dusty regions of star birth to the exquisite shells of dying stars. Here, a useful orienting feature is the Summer Triangle.''</blockquote></div></td></tr>
</table>Bferrellhttp://wiki.bdfserver.com/index.php?title=Our_Night_Sky&diff=1651&oldid=prevBferrell: /* Episode 11 The Summer Sky 100px */2019-04-21T16:23:39Z<p><span dir="auto"><span class="autocomment">Episode 11 The Summer Sky 100px</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 12:23, 21 April 2019</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Episode 11 The Summer Sky [[Image:3-stars.png|100px]] ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Episode 11 The Summer Sky [[Image:3-stars.png|100px]] ==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Pretty good, but again, a sky tour. We start by learning how to use Ursa Major to find the Summer Triangle and Vega (and the Northern Cross). Then we learn about Epislon Lyrae, the double double star. Apparently those with excellent vision can detect this is a double star, but with about 100X-125X magnification shows that each star is actually a double. Then ere is the Ring Nebula (M57), which requires a scope, but with 125-200X magnification you can see what looks like a smoke ring. This is a planetary nebula, the final stage of a star, much lower power than a supernova, and this is what we expect to happen to the Sun.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Pretty good, but again, a sky tour. We start by learning how to use Ursa Major to find the Summer Triangle and Vega (and the Northern Cross). Then we learn about Epislon Lyrae, the double double star. Apparently those with excellent vision can detect this is a double star, but with about 100X-125X magnification shows that each star is actually a double. Then ere is the Ring Nebula (M57), which requires a scope, but with 125-200X magnification you can see what looks like a smoke ring. This is a planetary nebula, the final stage of a star, much lower power than a supernova, and this is what we expect to happen to the Sun.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">At the top of the Summer Triangle is Deneb, 1,425 LY away, a blue super giant 110x the radius and 54,000X more luminous than the Sun and in one night it puts out as much energy as the sun in 300 years. Then we look at Albiero, the most beautiful double in the sky with a 3.1 yellow K giant and 5.1 hot blue B8 star 34 arc seconds apart (pretty far for binaries).</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Arching high overhead in the summer sky is the Milky Way, which is the plane of our galaxy seen from the inside. Tour this densely packed region of stars of all types, from dusty regions of star birth to the exquisite shells of dying stars. Here, a useful orienting feature is the Summer Triangle.''</blockquote></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Arching high overhead in the summer sky is the Milky Way, which is the plane of our galaxy seen from the inside. Tour this densely packed region of stars of all types, from dusty regions of star birth to the exquisite shells of dying stars. Here, a useful orienting feature is the Summer Triangle.''</blockquote></div></td></tr>
</table>Bferrellhttp://wiki.bdfserver.com/index.php?title=Our_Night_Sky&diff=1650&oldid=prevBferrell: /* Episode 11 The Summer Sky 100px */2019-04-21T16:13:33Z<p><span dir="auto"><span class="autocomment">Episode 11 The Summer Sky 100px</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 12:13, 21 April 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l144">Line 144:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Episode 11 The Summer Sky [[Image:3-stars.png|100px]] ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Episode 11 The Summer Sky [[Image:3-stars.png|100px]] ==</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Pretty good, but again, a sky tour. We start by learning how to use Ursa Major to find the Summer Triangle and Vega (and the Northern Cross).</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Pretty good, but again, a sky tour. We start by learning how to use Ursa Major to find the Summer Triangle and Vega (and the Northern Cross)<ins style="font-weight: bold; text-decoration: none;">. Then we learn about Epislon Lyrae, the double double star. Apparently those with excellent vision can detect this is a double star, but with about 100X-125X magnification shows that each star is actually a double. Then ere is the Ring Nebula (M57), which requires a scope, but with 125-200X magnification you can see what looks like a smoke ring. This is a planetary nebula, the final stage of a star, much lower power than a supernova, and this is what we expect to happen to the Sun</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Arching high overhead in the summer sky is the Milky Way, which is the plane of our galaxy seen from the inside. Tour this densely packed region of stars of all types, from dusty regions of star birth to the exquisite shells of dying stars. Here, a useful orienting feature is the Summer Triangle.''</blockquote></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Arching high overhead in the summer sky is the Milky Way, which is the plane of our galaxy seen from the inside. Tour this densely packed region of stars of all types, from dusty regions of star birth to the exquisite shells of dying stars. Here, a useful orienting feature is the Summer Triangle.''</blockquote></div></td></tr>
</table>Bferrellhttp://wiki.bdfserver.com/index.php?title=Our_Night_Sky&diff=1649&oldid=prevBferrell: /* Episode 11 The Summer Sky 100px */2019-04-21T16:06:02Z<p><span dir="auto"><span class="autocomment">Episode 11 The Summer Sky 100px</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 12:06, 21 April 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l144">Line 144:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Episode 11 The Summer Sky [[Image:3-stars.png|100px]] ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Episode 11 The Summer Sky [[Image:3-stars.png|100px]] ==</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Pretty good, but again, <del style="font-weight: bold; text-decoration: none;">like Episode 10, much of this is covered elsewhere so it feels less valuable, though it's exclusion would also seem strange</del>. <del style="font-weight: bold; text-decoration: none;">Worth watching</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Pretty good, but again, <ins style="font-weight: bold; text-decoration: none;">a sky tour</ins>. <ins style="font-weight: bold; text-decoration: none;">We start by learning how to use Ursa Major to find the Summer Triangle and Vega (and the Northern Cross)</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Arching high overhead in the summer sky is the Milky Way, which is the plane of our galaxy seen from the inside. Tour this densely packed region of stars of all types, from dusty regions of star birth to the exquisite shells of dying stars. Here, a useful orienting feature is the Summer Triangle.''</blockquote></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Arching high overhead in the summer sky is the Milky Way, which is the plane of our galaxy seen from the inside. Tour this densely packed region of stars of all types, from dusty regions of star birth to the exquisite shells of dying stars. Here, a useful orienting feature is the Summer Triangle.''</blockquote></div></td></tr>
</table>Bferrellhttp://wiki.bdfserver.com/index.php?title=Our_Night_Sky&diff=1648&oldid=prevBferrell: /* Episode 10 The Spring Sky 100px */2019-04-21T15:26:52Z<p><span dir="auto"><span class="autocomment">Episode 10 The Spring Sky 100px</span></span></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Episode 10 The Spring Sky [[Image:3-stars.png|100px]] ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Episode 10 The Spring Sky [[Image:3-stars.png|100px]] ==</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Pretty good, but constellation history is covered everywhere, so a lot of this wasn't really new to me.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Pretty good, but constellation history is covered everywhere, so a lot of this wasn't really new to me. <ins style="font-weight: bold; text-decoration: none;"> Ursa Major, Virgo, and Bootes are the main constellations. Leo is also in the sky, and Leo contains Regulus about 79 LY away, and Algieba which is a double star (126 LY away). Leo also contains 2 triplets of galaxies about 26 million LY away M95/96/105 is the first and M65/66/NGC3628 the second. </ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">There is in this part of the sky, near Virgo, is the Realm of galaxies. In the diamond of Virgo, between Arcturus, Cor Carolina, Denebola, and Spica, on the right hand side between Virgo and Coma Berenice are a hundred or more galaxies, about 60 million light years away and 14 million wide, including M84/86/87. Many of these are elliptical galaxies which only have old yellow, orange, and red stars, having used up their gas long ago. Within M87 is a supermassive black hole with a large accretion disk and large jets of material being expelled close to the speed of light. This makes it (Virgo A) one of the brightest radio targets. </ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">In the southern part of Virgo is a nearly edge-on spiral galaxy, M104 the Sombrero Galaxy. </ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''The spring sky opens the view into intergalactic space perpendicular to the plane of the Milky Way. Among the objects visible are the immensely rich galaxy clusters in Virgo and Coma Berenices, which are many millions of light-years distant and can be seen with small and moderate telescopes.''</blockquote></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''The spring sky opens the view into intergalactic space perpendicular to the plane of the Milky Way. Among the objects visible are the immensely rich galaxy clusters in Virgo and Coma Berenices, which are many millions of light-years distant and can be seen with small and moderate telescopes.''</blockquote></div></td></tr>
</table>Bferrellhttp://wiki.bdfserver.com/index.php?title=Our_Night_Sky&diff=1647&oldid=prevBferrell: /* Episode 9 The Winter Sky 100px */2019-04-21T00:04:48Z<p><span dir="auto"><span class="autocomment">Episode 9 The Winter Sky 100px</span></span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:04, 20 April 2019</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Open Clusters typically have 50-100 stars in the plain of the Milky Way with young, hot, blue stars. Globular clusters are bigger, having a 10,000 to a million and are not on the plane, but typically surrounding it in a halo near the center. All the stars in a cluster are the same distance away from us, and have the same composition. The Pleiades (M45) is an open cluster, ‘the Seven Sisters’. Folklore has it that it’s time to plant when the Sister become visible, and to harvest when the set for the winter.Between Perseus and Cassiopeia is the double cluster NGC 884/869, the open clusters. A low power, wide field eye piece, will fit both clusters. Another nearby cluster are the Hyades within the face of the Bull. The Hyades are one of the most clusters for judging distances and luminosities of other stars, and are just 151 LY away. Also in Taurus is M1, the Crab Nebula, and exploded star.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Open Clusters typically have 50-100 stars in the plain of the Milky Way with young, hot, blue stars. Globular clusters are bigger, having a 10,000 to a million and are not on the plane, but typically surrounding it in a halo near the center. All the stars in a cluster are the same distance away from us, and have the same composition. The Pleiades (M45) is an open cluster, ‘the Seven Sisters’. Folklore has it that it’s time to plant when the Sister become visible, and to harvest when the set for the winter.Between Perseus and Cassiopeia is the double cluster NGC 884/869, the open clusters. A low power, wide field eye piece, will fit both clusters. Another nearby cluster are the Hyades within the face of the Bull. The Hyades are one of the most clusters for judging distances and luminosities of other stars, and are just 151 LY away. Also in Taurus is M1, the Crab Nebula, and exploded star.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Next we learn about Castor and Pollux, the heads of the Gemini twins.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Next we learn about Castor and Pollux, the heads of the Gemini twins<ins style="font-weight: bold; text-decoration: none;">. Near the twins feet is M35, an open cluster. In Cancer we find M44, the Beehive cluster (or Praesepe). The Tropic of Cancer was named for this constellation as the Sun used to be in Cancer on the solstice, but precession has since moved it. The Beehive is a good binocular target, about 550 LY away, with about 1,500 stars about 600 million years old. Within Auriga the charioteer is Capella, but it contains M36/37/M38, all good small telescope objects</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Continuing your focus on the constellations of the Northern Hemisphere, survey the magnificent winter sky, dominated by Orion. &#34;Star hop&#34; around the region, which includes a wealth of interesting stars, globular clusters, nebulae, and other features, especially the Orion Nebula&mdash;the finest nebula in the northern sky&mdash;and the Pleiades and Hyades star clusters in Taurus.''</blockquote></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Continuing your focus on the constellations of the Northern Hemisphere, survey the magnificent winter sky, dominated by Orion. &#34;Star hop&#34; around the region, which includes a wealth of interesting stars, globular clusters, nebulae, and other features, especially the Orion Nebula&mdash;the finest nebula in the northern sky&mdash;and the Pleiades and Hyades star clusters in Taurus.''</blockquote></div></td></tr>
</table>Bferrellhttp://wiki.bdfserver.com/index.php?title=Our_Night_Sky&diff=1646&oldid=prevBferrell: /* Episode 9 The Winter Sky 100px */2019-04-20T23:43:49Z<p><span dir="auto"><span class="autocomment">Episode 9 The Winter Sky 100px</span></span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<tr class="diff-title" lang="en">
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 19:43, 20 April 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l126">Line 126:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Canis Major and Minor, Orion’s hunting dogs, including Sirius - a A1 class star only 8.6 LY away, one of the closest star systems, and the brightest in our skies. Next we move to Taurus the Bull and the Pleiades. Aldebaran is the largest star in Taurus, which means ‘the follower’ because it follows Taurus. It’s a K3 only 67 LY from the Sun. </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Canis Major and Minor, Orion’s hunting dogs, including Sirius - a A1 class star only 8.6 LY away, one of the closest star systems, and the brightest in our skies. Next we move to Taurus the Bull and the Pleiades. Aldebaran is the largest star in Taurus, which means ‘the follower’ because it follows Taurus. It’s a K3 only 67 LY from the Sun. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Open Clusters typically have 50-100 stars in the plain of the Milky Way with young, hot, blue stars. Globular clusters are bigger, having a 10,000 to a million and are not on the plane, but typically surrounding it in a halo near the center. All the stars in a cluster are the same distance away from us, and have the same composition. The Pleiades (M45) is an open cluster, ‘the Seven Sisters’. Folklore has it that it’s time to plant when the Sister become visible, and to harvest when the set for the winter.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Open Clusters typically have 50-100 stars in the plain of the Milky Way with young, hot, blue stars. Globular clusters are bigger, having a 10,000 to a million and are not on the plane, but typically surrounding it in a halo near the center. All the stars in a cluster are the same distance away from us, and have the same composition. The Pleiades (M45) is an open cluster, ‘the Seven Sisters’. Folklore has it that it’s time to plant when the Sister become visible, and to harvest when the set for the winter<ins style="font-weight: bold; text-decoration: none;">.Between Perseus and Cassiopeia is the double cluster NGC 884/869, the open clusters. A low power, wide field eye piece, will fit both clusters. Another nearby cluster are the Hyades within the face of the Bull. The Hyades are one of the most clusters for judging distances and luminosities of other stars, and are just 151 LY away. Also in Taurus is M1, the Crab Nebula, and exploded star.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Next we learn about Castor and Pollux, the heads of the Gemini twins</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></br></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Continuing your focus on the constellations of the Northern Hemisphere, survey the magnificent winter sky, dominated by Orion. &#34;Star hop&#34; around the region, which includes a wealth of interesting stars, globular clusters, nebulae, and other features, especially the Orion Nebula&mdash;the finest nebula in the northern sky&mdash;and the Pleiades and Hyades star clusters in Taurus.''</blockquote></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><blockquote>''Continuing your focus on the constellations of the Northern Hemisphere, survey the magnificent winter sky, dominated by Orion. &#34;Star hop&#34; around the region, which includes a wealth of interesting stars, globular clusters, nebulae, and other features, especially the Orion Nebula&mdash;the finest nebula in the northern sky&mdash;and the Pleiades and Hyades star clusters in Taurus.''</blockquote></div></td></tr>
</table>Bferrell