Question

What is Dark Energy...?​

Answer 1

In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales.

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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. They thought the expansion might continue forever, or eventually – if the universe had enough mass and therefore enough self-gravity – reverse and cause a Big Crunch. Now, in early 21st century cosmology, that idea has evolved. The universe is seen as expanding faster today than billions of years ago. What could be causing the rate of expansion to increase? Astronomers now sometimes speak of a repulsive force as a possible way to understand it.