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Curious Cometary Knots in the Helix Nebula
amgumen
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4-13-2008 8:16 PM
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4-14-2008
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tabsey
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/71989475-83d4-41b1-acde-4a6df6fe1cd1/B1EC0002-D328-4454-B79F-FEBE5203E653/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://apod.nasa.gov/apod/ap080413.html" href="http://apod.nasa.gov/apod/ap080413.html" style="font-size: 11px;">apod.nasa.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://apod.nasa.gov/apod/ap080413.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/apod.nasa.gov/img/651D5734-6BF1-419F-B12D-9F7927E742A8" alt="See Explanation. Clicking on the picture will download the highest resolution version available." /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://apod.nasa.gov/apod/ap080413.html"> What causes unusual knots of gas and dust in <A href="http://www.noao.edu/jacoby/pn_gallery.html">planetary nebulas</A>? Seen also in the <A href="http://apod.nasa.gov/apod/ap060625.html">Ring Nebula</A>, the <A href="http://apod.nasa.gov/apod/ap030113.html">Dumbbell Nebula</A> and the <A href="http://apod.nasa.gov/apod/ap060709.html">Eskimo Nebula</A>, the knots' existence was not initially predicted and their origins are still not well understood. <A href="http://hubblesite.org/newscenter/archive/releases/1996/13/image/a/">Pictured above</A> is a fascinating image of the <A href="http://apod.nasa.gov/apod/ap060112.html">Helix Nebula</A> by the <A href="http://hubblesite.org/the_telescope/">Hubble Space Telescope</A> showing tremendous detail of its mysterious gaseous knots. The above cometary knots have masses similar to the Earth but have radii typically several times the orbit of Pluto. <A href="http://www.journals.uchicago.edu/doi/full/10.1086/501226">One hypothesis</A> for the fragmentation and evolution of the knots includes existing gas being <A href="http://en.wikipedia.org/wiki/Rayleigh-Taylor_instability">driven out</A> by a less dense but highly energetic <A href="http://en.wikipedia.org/wiki/Stellar_wind">stellar wind</A> of the central evolving star. The <A href="http://en.wikipedia.org/wiki/Helix_Nebula">Helix Nebula</A> is the closest example of a <A href="http://en.wikipedia.org/wiki/Planetary_nebula">planetary nebula</A> created at the end of the <A href="http://wind.cc.whecn.edu/~marquard/astronomy/sunlike.htm">life of a Sun-like star</A>. </blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/B1EC0002-D328-4454-B79F-FEBE5203E653/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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