Question

What is dark energy in simple terms?

Answer 1

Dark energy is the name given to the force that is believed to be making the universelarger. 

Answer 2

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Dark energy is the name given to the mysterious force that's causing the rate of expansion of our universe to accelerate over time, rather than to slow down. That's contrary to what one might expect from a universe that began in a Big Bang. Astronomers in the 20th century learned the universe is expanding.

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