Dark energy makes up almost 70% of our universe and is believed to be the reason the universe is expanding. Yet very, very little is known about it. To figure out what we do know — and what it could tell us about the fate of the universe, we talked to astrophysicist Sarafina Nance). She studies cosmology, a field that looks at the origin and development of the universe.Learn more about sponsor message choices: podcastchoices.com/adchoices)NPR Privacy Policy)
