Black Holes (BHs) are the standard-bearers of cool Physics. Pop culture is full of references to these objects that are so powerful that nothing can escape them. A lot of Physicists have spent their lives thinking about how BHs are formed, how they can be detected and what happens to objects that enter a BH.

We are told that we live in a universe filled with a mysterious entity called dark energy. In this article we try to explain what scientists mean by dark energy, and how we infer it exists.

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