For the first time, a team of astronomers has observed several pairs of galaxies in the final stages of merging together into single, larger galaxies. Peering through thick walls of gas and dust surrounding the merging galaxies' messy cores, the research team captured pairs of supermassive black holes -- each of which once occupied the center of one of the two original smaller galaxies -- drawing closer together before they coalescence into one giant black hole.
via Science Daily
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