UGC 12591 lies just under 400 million light-years away from us in the Pisces-Perseus Supercluster. Credit: ESA/Hubble & NASA
UGC 12591 sits somewhere between a lenticular and a spiral. It lies just under 400 million light-years away in the westernmost region of the Pisces-Perseus Supercluster, a long chain of galaxy clusters that stretches out for hundreds of light-years – one of the largest known structures in the cosmos. The galaxy itself is also extraordinary: it is incredibly massive. The galaxy and its halo together contain several hundred billion times the mass of the sun; 4 times the mass of the Milky Way. It also whirls round extremely quickly, rotating at speeds of up to 1.1 million miles per hour.
Observations with Hubble are helping astronomers to understand the mass of UGC 1259...
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