On Thursday, scientists announced that they had recorded the sound of two black holes colliding a billion light years away, providing the first real proof that gravitational waves actually exist--something Albert Einstein predicted 100 years ago in his famous paper on general relativity. If you would like an introduction to the whole concept of gravitational waves, I'd recommend watching the animation below, created by PhD Comics--the same folks who created a handy animation explaining the Higgs Boson when it was confirmed back in 2012.
But, for the moment, I'd really like you to listen to the "Gravitational Wave Chirp," the audio recording unveiled by scientists this week. (Hear it up top.) As The New York Times describes it, the chirp rises to "the note of middle C before abruptly stopping," And it's likely to "take its place among the great sound bites of science," ranking up there with Alexander Graham Bell’s “Mr. Watson — come here” and Sputnik’s first beeps from orbit." Decades from now, you can tell your grandkids you heard it here first.