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.”
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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…