A mysterious background of extremely low-frequency gravitational waves detected by networks of pulsars may carry information about events that began more than 13 billion years ago-including the formation of some of the first supermassive black holes in the universe.
A mysterious background of extremely low-frequency gravitational waves detected by networks of pulsars may carry information about events that began more than 13 billion years ago-including the formation of some of the first supermassive black holes in the universe.
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