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Astronomers missed a space explosion as powerful as a billion suns — until they spotted its echo

A cosmic explosion with an energy equivalent to the output of a billion suns went unnoticed by astronomers until they caught ...
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Satellites are crowding Earth’s orbit and a space disaster could be days away

Low Earth orbit has shifted from a quiet scientific outpost to one of the busiest pieces of real estate in human history. With tens of thousands of satellites and fragments now circling overhead, ...