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The Pinwheel Galaxy (also known as Messier 101 or NGC 5457) is a face-on spiral galaxy distanced 21 million light-years (six megaparsecs away in the constellation Ursa Major

M101 is a relatively large galaxy compared to the Milky Way. With a diameter of 170,000 light-years it is seventy percent larger than the Milky Way.

It has a disk mass on the order of 100 billion solar masses, along with a small bulge of about 3 billion solar masses.

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13y ago

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