The meeting of two black holes in the galaxy NGC 6240 started 30 million years ago, but the ending was known from the beginning: in the end, there can only be one super-massive black hole. [Chandra Observatory]
The meeting of two black holes in the galaxy NGC 6240 started 30 million years ago, but the ending was known from the beginning: in the end, there can only be one super-massive black hole. [Chandra Observatory]
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