IC 10
A nearby dwarf irregular galaxy that is home to the most massive known stellar black hole – IC 10 X-1. IC 10 lies approximately 1.8 million light-years away in the constellation Cassiopeia. It is the only known starburst galaxy in the Local Group and is particularly rich in Wolf-Rayet stars, one of which is the companion of IC 10 X-1. IC 10 was discovered by Lewis Swift in 1889 but not suspected of being extragalactic until the 1930s.
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