Explanation: How can a round star make a square nebula? This conundrum comes to light when studying planetary nebulae like IC 4406. Evidence indicates that [url=http://www.astro.psu.edu/users/rbc/IC4406.html" >IC 4406 is likely a hollow cylinder, with its square appearance the result of our vantage point in viewing the cylinder from the side. Were Ring Nebula. [url=http://hubblesite.org/newscenter/archive/releases/2002/14/image/a/" >This representative-color picture is a composite made by combining Hubble Space Telescope in 2001 and 2002. Hot gas [url=http://adsabs.harvard.edu/abs/1991A%26A...251..560S" >flows out the ends of the cylinder, while filaments of dark molecular gas lace the bounding walls. The star primarily responsible for this [url=http://apod.nasa.gov/apod/ap000416.html" >interstellar sculpture can be found in the planetary nebula's center. In a few million years, the only thing left visible in white dwarf star.
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