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'Giant arc' stretching 3.3 billion light-years across the cosmos shouldn't exist

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 17 hours ago
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A newly discovered crescent of galaxies spanning 3.3 billion light-years is among the largest known structures in the universe and challenges some of astronomers' most basic assumptions about the cosmos. The epic arrangement, called the Giant Arc, consists of galaxies, galactic clusters, and lots of gas and dust. It is...
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