In this video, Saul Perlmutter explains how dark energy, which makes up 70 percent of the universe, is causing our universe to expand.
This interesting video explains dark matter and how it applies to the universe.
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Einstein devised the cosmological constant to explain a static universe, but when the universe was found to be expanding he called it a blunder. But it might be real; it might be dark energy.
Explains what scientists think dark matter is and how we can detect it far out in the universe.