Nightmare at the end of the universe

Dark energy is the strange stuff that makes up the vast majority of the universe and will ultimately lead to the end of everything. Unless it doesn't exist at all.

Guests: Adam Riess, astrophysicist at Johns Hopkins University, and Nathalie Palanque-Delabrouille, director of the Physics Division at the Lawrence Berkeley National Laboratory and member of The Dark Energy Spectroscopic Instrument

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