What the hell are Baryon Acoustic Oscillations?

Ethan Siegel
Apr 15, 2015 · 6 min read

They’re our best measurement of dark energy, even better than supernovae!

“If you think this Universe is bad, you should see some of the others.”
Philip K. Dick

Imagine you’re looking out at the Universe, at all the points of light that are out there — planets, stars, galaxies, clusters of galaxies and more — and you want to use what you’re seeing to…