What Is Dark Energy? An Astrophysicist Explains | Edge Of Knowledge | Ars Technica

When scientists set out to measure what they expected to be a slow down in the expansion of the universe, they discovered the exact opposite: the expansion of the universe isn't slowing, but accelerating. The unknown forces behind this acceleration have been dubbed 'dark energy' - and Dr. Paul Sutter breaks down what we know about it, what we don't, and where current research is leading us.

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