Giant Arc Structure 1/15th The Size Of The Observable Universe Challenges What We Know About The CosmosGiant Arc Structure 1/15th The Size Of The Observable Universe Challenges What We Know About The CosmosAccording to our best models, nothing should be that big.Astronomers spotted the Giant Arc in the constellation of Boötes the Herdsman.Image credit: Allexxandar/Shutterstock.comA giant...
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