The Andromeda Galaxy, also called M31, is a huge spiral galaxy fairly close in size and mass to our own Milky Way. Like the Milky Way it also has a central bulge of stars, and a supermassive black hole in its very core. In 1993, though, astronomers got a shock when Hubble images revealed not one but two blobs of light surrounding the core.
One of these two blobs was blue, the other redder. The observation history is a bit complex, but by 2012 it was clear that the blue blob was a cluster of hot, young stars surrounding the central supermassive black hole, and apparently about 100 – 200 million years old. The other feature was a lopsided elliptical disk of redder stars surrounding the blue cluster, brighter on one side than the other.
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