M101 (NGC 5457) – Pinwheel Galaxy – a spiral galaxy with a weak nucleus and very well developed arms in the constellation Ursa Major. Brightness is 7.9 Magnitude.The diameter of M101 is 170 000 light years, and its mass is approximately equal to 180 billion solar masses. It’s 21 million
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Astrophotography by Dariusz Krzempek
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