The researchers said they believe the early universe was full of dwarf galaxies, which eventually merged together to form larger galaxies.
Dwarf galaxies are determined by having a total mass of fewer than three billion suns. For comparison, the Milky Way galaxy has a total mass of 60 billion suns.
Olivia Holmes, also with the University of Alabama at Tuscaloosa, is the study’s co-author. She said that with the discovery of the first two different pairs of black holes in colliding dwarf galaxies, scientists can use them as analogs for ones in the early universe. One pair of black holes is in the galaxy cluster Abell 133, which is 760 million light-years from Earth.
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