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Milky Way-Like Galaxies in the Early Universe

Milky Way-Like Galaxies in the Early Universe

Astronomers using ALMA have directly observed a pair of Milky Way-like galaxies seen as they appeared billions of years ago. These progenitors of today’s giant spiral galaxies are surrounded by "super halos" of hydrogen gas that extend many tens-of-thousands of light-years beyond their dusty, star-filled disks.