Optical photograph of the Pinwheel Galaxy (M101,NGC 5457),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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / NOAO |
Taille de l’image : | 4159 px × 3402 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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