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Double trouble! Two pairs of giant black holes spotted on collision course

You wait for an age to see a colliding pair of black holes in a dwarf galaxy and then two come along at once! Astronomers have spotted not one but two dwarf galaxy black hole duos on separate collision courses, the first observational evidence of such a cosmic clash. 

Just as the black holes are heading for a collision and merger that will leave a more massive black hole behind, the dwarf galaxies they sit in will also merge and form a larger galaxy. That means the findings could have important implications for our understanding of how these cosmic titans and the galaxies they inhabit grew in the early universe.

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