By looking at clusters of distant galaxies, astronomers have probed how the imprint of sound waves (white circle) serves as a sort of cosmic ruler through time. At left are galaxies as they appeared 3.8 billion years ago; at center, 5.5 billion years ago; and at right, 13.7 billion years ago soon after the Big Bang.
Credit: E.M. Huff; SDSS-III; South Pole Telescope. Graphic by Zosia Rostomian.
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