Friday, February 11, 2011

APOD 3.4

This is a picture of the constellation Orion. All the stars have been stretched out far to show their colors. All of the stars are blue besides Betelgeuse. That's because Betelgeuse is a red giant star, and all the others aren't. Rigel is the most white, because it is a blue supergiant. Red stars are the coolest, and blue stars are hotter.

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