is a face-on spiral galaxy distanced 21 million light-years (six megaparsecs) away from Earth in the constellation Ursa Major. M101 is a large galaxy, with a diameter of 170,000 light-years. By comparison, the Milky Way has a diameter of 100,000 light years. It has around a trillion stars, twice the
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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