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</td></tr><tr><td class="sbcell" valign="top"><table border="0" cellspacing="0" cellpadding="5"><tr><td><font class="boxcaption">An image of the Red Square nebula surrounding the hot star MWC 922. The picture was taken with infrared adaptive optics imaging at Palomar and Keck Observatories. Credit: Peter Tuthill, Palomar and Keck Observatories<br></font></td></tr></table></td></tr><tr><td class="sbcell" bgcolor="#f6f6f6" height="1"><img src="http://a1484.g.akamaitech.net/f/1484/827/1h/www.space.com/template_images/elements/transpacer.gif" height="1" alt="" border="0"></td></tr>
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 			<font face="Verdana, Helvetica, sans-serif" size="3" color="#1B4872"><b>Near-Perfect Symmetry Revealed in Red Cosmic Square </b><br><font face="Verdana, Helvetica, sans-serif" size="1" color="#333333"><b>By <a href=http://www.livescience.com/blogs/author/kerthan>Ker Than</a></b><br>Staff Writer<br></font></font><font size="1" face="arial,helvetica" color="#330066">posted: 12 April 2007<br>02:00 pm ET</font><br>
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<p class="style1">If symmetry  is a sign of splendor, then the newly discovered Red   Square nebula is one of the most beautiful objects in the  universe.</p>
<p class="style1">Seen in the  infrared, the nebula resembles a <a href="http://www.space.com/php/multimedia/imagedisplay/img_display.php?pic=070412_red_square_02.jpg&amp;cap=An+image+of+the+Red+Square+nebula+surrounding+the+hot+star+MWC+922.+The+picture+was+taken+with+infrared+adaptive+optics+imaging+at+Palomar+and+Keck+Observator">giant,  glowing red box</a> in the sky, with a bright white inner core. A dying star  called MWC 922 is located at the system&rsquo;s center and spewing its innards from opposite  poles into space. (A nebula is an interstellar cloud of gas, dust and plasma  where stars can both emerge and die.)</p>
<p class="style1">&ldquo;This  spectacular event is the death of a star,&rdquo; said study team member James Lloyd  of Cornell University.</p>
<p class="style1">After MWC  922 ejects most of its material into space, it will contract into a dense  stellar corpse known as a <a href="http://www.space.com/scienceastronomy/061222_wdwarf_disk.html">white  dwarf</a>, shrouded by clouds of its own remains.</p>
<p class="style1">The Red Square nebula discovery is detailed in the April 13  issue of the journal <em>Science</em>.</p>
<p class="style1"><strong>Almost perfect</strong></p>
<p class="style1">What is  particularly astonishing about the Red Square,  the researchers say, is the degree of symmetry seen in lines, or &ldquo;rungs,&rdquo; that  bisect its surface. The rungs appear as shadows, and their makeup is uncertain.</p>
<p class="style1">&ldquo;The high  degree of regularity in this case may point to the intriguing possibility that  these bands are shadows cast by periodic ripples or waves on the surface of an  inner disk close to the star at the heart of the system,&quot; Lloyd said.</p>
<p class="style1">The Red Square ranks among the most symmetrical objects ever  observed by scientists. &nbsp;&ldquo;If you fold  things across the principle diagonal axis, you get an almost perfect reflection  symmetry,&rdquo; said study leader Peter Tuthill from the University  of Sydney in Australia. &ldquo;This makes the Red Square nebula the most symmetrical object of  comparable complexity ever imaged.&rdquo;</p>
<p class="style1">The Red Square&rsquo;s extreme symmetry suggests the star&rsquo;s  surroundings are extremely still and not buffeted by external stellar winds or other  turbulence.</p>
<p class="style1">The  researchers propose that similar conditions are contributing to the extreme symmetry  of another system, the <a href="http://www.space.com/scienceastronomy/070406_red_rectangle.html">Red  Rectangle</a>, whose central star is cooler than that of the Red   Square. </p>
<p class="style1">&ldquo;The Red  Rectangle is <em>mostly</em> symmetrical, but  it has some asymmetries,&rdquo; Lloyd told <em>SPACE.com</em>.  &ldquo;It wasn&rsquo;t clear whether it was because the outflow was very symmetrical or  whether material in the outflow was encountering some other material&rdquo; which  introduced the symmetry.</p>
<p class="style1">The new  findings suggest the system&rsquo;s perfect form results from an even outflow of gas.  &ldquo;The reason the Red Square remains so  symmetrical is that there is no material that has interfered with the outflow,  so it has preserved the symmetry it was born with,&rdquo; Lloyd said.</p>
<p class="style1"><strong>Adaptive optics</strong></p>
<p class="style1">Tuthill and  Lloyd spotted the Red Square using the 200-inch Hale Telescope at Caltech&rsquo;s  Palomar Observatory and the Keck-2 Telescope in Hawaii.</p>
<p class="style1">Both  telescopes utilize a relatively new type of imaging called <a href="http://www.space.com/scienceastronomy/astronomy/adaptive_optics991006.html">adaptive  optics</a>, which uses a laser guide star as a reference and a rapidly  deforming mirror to correct image distortions from the Earth&rsquo;s atmosphere in  real time.</p>
<p class="style1">Adaptive  optics &ldquo;acts like a myopia cure for a telescope,&rdquo; Lloyd said.</p>
<ul type="disc" class="style1">
  <li><a href="http://www.space.com/scienceastronomy/070406_red_rectangle.html">Mystery       of Red Space Glow Solved</a> </li>
  <li><a href="http://www.space.com/scienceastronomy/060411_space_shapes.html">Skulls,       Tornadoes and Insects - The Bizarre Sightings of Modern Astronomy</a></li>
  <li><a href="http://www.space.com/bestimg/?cat=strangest">Vote Now: The Strangest       Things in Space</a></li>
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