Question

What is Dark Energy...?​

Answer 1

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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.

Answer 2

Answer:

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.

By fitting a theoretical model ofDark energy is not only terribly important for astronomy, it's the central problem for physics. It's been the bone in our throat for a long time.” ... In the 1990s, they discovered a previously unknown "dark energy" that is causing the universe to expand faster as it ages.

the composition of the universe to the combined set of cosmological observations, scientists have come up with the composition that we described above, ~68% dark energy, ~27% dark matter, ~5%