Hand-coloured optical photograph of the Pinwheel Galaxy (M101,NGC 5457),a large,bright spiral galaxy (type Sc) 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. See New Astronomy page 179 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
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