Friday, April 20, 2012

APOD 4.4

See Explanation.  Clicking on the picture will download
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The Ring Nebula is one of the most photographic celestial bands other than Saturn's rings. The Earth is positioned so we look directly into the center, making it even more magnificent. The nebula is a shroud of a once sun-like star dying. It has a large expanse of ring like stractures branching away from the center. The intense ultraviolet coming from the center ionizes atoms in gas. Ionized oxygen atoms produce the greenish glow, while the reddish glow is produced by ionized hydrogen.The central ring is about one light year across and is 2,000 light years away. It is found in the constellation Lyra.

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