Astronomers just found the largest galaxy ever discovered, and they have no idea how it got so big. 

At 16.3 million light-years wide, the Alcyoneus galaxy has a diameter 160 times wider than the Milky Way and four times that of the previous title holder, IC 1101, which spans 3.9 million light-years, researchers reported in a new study. Named after one of the mythical giants who fought Hercules and whose name means “mighty ass” in Greek, Alcyoneus is roughly 3 billion light-years from Earth


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