6 years ago
Massive galaxies began merging just 1.5 billions years after the Big
Housing thousands of galaxies and an absurd amount of stars, galaxy clusters are the most massive known objects in the universe. It was previously believed that these clusters formed when young starburst galaxies collided about 3 billion years after the Big Bang, but now, two teams of international researchers think that the pileup occurred much earlier. By peering into the universe’s ancient past, they saw the collisions beginning just 1.5 billion years after the Big Bang, drastically increasing the age of some of our oldest cosmic residents.
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