Ring Nebula Is More Like A Jelly Doughnut, NASA Says
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http://www.npr.org/blogs/thetwo-way/2013/05/24/186489695/ring-nebula-is-more-like-a-jelly-doughnut-nasa-says
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http://media.npr.org/assets/img/2013/05/24/nebula_wide-a3344295066f677dfccb3ee66c3ea2c44570efb6-s40.jpg
> The Ring Nebula, whose iconic shape and large size make it a favorite
> of amateur astronomers, can now be seen in new detail, after NASA's
> Hubble Space Telescope captured a sharp image of the nebula.
> Researchers say the new clarity reveals details that were previously
> unseen, and a structure that's more complex than scientists had
> believed.
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> "The nebula is not like a bagel, but rather, it's like a jelly
> doughnut, because it's filled with material in the middle," says C.
> Robert O'Dell of Vanderbilt University, who leads a team of
> researchers studying the Ring Nebula. They combined Hubble's
> visible-light images with infrared data from telescopes on Earth.