Image of the Day: Hubble Captures a Ghostly Pinwheel Nebula
September 16th, 2010
This spooky image expanding pinwheel spiral shows a rare binary system called LL Pegasi and a surrounding "pre-planetary nebula" known as IRAS 23166+1655. This striking pattern is formed by material being ejected from a dying staralong with a second star -- a binary partner -- orbiting with it and modulating the expanding gas. Hubble captured LL Pegasi from above, so as the stars orbit, we can see a perfect gas spiral expand into space.
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