Pinwheel Galaxy Disc

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(also known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy distanced 21 million light-years (six megaparsecs)  away from Earth in the constellation Ursa Major. It was discovered by Pierre Méchain on March 27, 1781 and was communicated to Charles Messier.

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 number in the Milky Way.