PBS Space Time

Sound Waves from the Beginning of Time

Season 5 Episode 11 | 12m 48s

Invisible to the naked eye, our night sky is scattered with the 100s of billions of galaxies the fill the known universe. Like the stars, these galaxies form constellations – hidden patterns that echo the reverberations of matter and light in an epoch long before galaxies ever formed. These are the baryon acoustic oscillations, and they may hold the key to understanding the nature of dark energy.

Aired: 02/11/19

Rating: NR

Problems Playing Video?