Vast Galactic Megamerger In the Early Universe Is 'Truly Unique' Discovery

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Vast Galactic Megamerger In the Early Universe Is 'Truly Unique' DiscoveryAn international team of astronomers has spotted a vast cosmic pileup of ancient galaxies at a time when the universe was just a tenth of its current age. Using the Atacama Large Millimeter/submillimeter Array (ALMA) and the Atacama Pathfinder Experiment (APEX), the scientists discovered an extremely dense concentration of young galaxies that are about to merge and form a galaxy cluster—the largest structure in the known universe. Astronomers previously thought these events only occurred around 3 billion years after the Big Bang, so they were surprised to find that this merger was happening when the universe was only half that age.


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