Unraveling Dark Energy and Cosmic Expansion

It's Space Week on Short Wave! Today, an encore of our episode on dark energy. This mysterious energy makes up almost 70% of our universe and is believed to be the reason the universe is expanding. Yet 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 talk to astrophysicist Sarafina Nance.

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