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Messier 101, also known as the Pinwheel galaxy, is a spiral galaxy located about 27 million light-years in the constellation Ursa Major, having a diameter about twice that of the Milky Way and containing vast amounts of high-density hydrogen gas, which gives it a fluffy-looking appearance. According to some estimations, it measures up to one trillion solar masses and is seems it is asymmetrical to one side, suggesting that in the past it interacted gravitationally with another galaxy passing by ... Read »