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Observations of the GOODS-North field are used to try to understand dark energy. P. Oesch/University of Geneva; M. Montes/University of New South Wales/ESA/NASA hide caption

toggle caption P. Oesch/University of Geneva; M. Montes/University of New South Wales/ESA/NASA

In this encore episode and Day 1 of our space-themed week, we explore 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, 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

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