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Pinwheel Galaxy, M101
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Pinwheel Galaxy (M101, NGC 5457) at 8th magnitude. This is a large, bright, spiral galaxy some 20 million light years away in the constellation of Ursa Major. M101 has a mass of three thousand million Suns and a diameter of approximately 200, 000 light years, around twice that of our own galaxy, the Milky Way. Its extremely narrow, far- flung spiral arms are dominated by huge clouds of glowing hydrogen, some of which are 3000 light years across.
March 7th, 2013
Viewed 16 Times - Last Visitor from Madison, WI on 12/07/2014 at 2:14 AM
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