This blackhole is in one of the densest galaxies known to date! The M60-UCD1 crams 140 million stars and has a diameter of around 300 light years.
If you lived inside it, the night sky would dazzle with at least 1 million stars visible to the naked eye

A black hole is a region of spacetime where gravity is so strong that nothing, including light or other electromagnetic waves, has enough energy to escape it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

Albert Einstein first predicted the existence of black holes in 1916, with his general theory of relativity. The term “black hole” was coined many years later in 1967 by American astronomer John Wheeler. After decades of black holes being known only as theoretical objects.19

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