Our corner of the universe is apparently very loud. Who knew?

Vestiges of Big Bang Waves Are Reported, from the NY Times

Astronomers reported on Tuesday that they had convincingly seen, in the patterns of galaxies scattered across the night sky, the vestiges of sound waves that rumbled through the universe after the Big Bang.

Stars and galaxies tended to form along the ripples of the sound waves where matter was slightly denser, and the pull of gravity was slightly stronger.