Astronomers at Yale and Harvard have found a galaxy with a heartbeat — and they’ve taken its pulse.

It is the first time scientists have measured the effect that pulsating older red stars have on the light of their surrounding galaxy.

“We tend to think of galaxies as steady beacons in the sky, but they are actually ‘shimmering’ due to all the giant pulsating stars in them,” said Pieter van Dokkum from Yale in New Haven, Connecticut.

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