Gravitational waves could help us find out how fast the expansion of the universe is accelerating

Gravitational waves emitted when distant black holes collide and merge, ringing the very fabric of space-time like bells, could be used to help measure how fast the universe is expanding, according to a new study.

Since the late 1990s, astronomers have known that not only is the universe expanding, but it’s doing so at an accelerating rate. The cause of this so-called late acceleration has remained mysterious, earning it the placeholder name”dark energy.”

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