Duo of titanic galaxies captured in extreme starbursting merger

New observations with the Atacama Large Millimeter/submillimeter Array (ALMA) have uncovered the never-before-seen close encounter between two astoundingly bright and spectacularly massive galaxies in the early universe. These so-called hyper-luminous starburst galaxies are exceedingly rare at this epoch of cosmic history—near the time when galaxies first formed—and may represent one of the most-extreme examples of violent star formation ever observed.

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