Question

What is dark energy........

Answer 1

Answer:

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

By fitting a theoretical model of 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% normal matter.

We need dark energy to explain why gravity seems to be driving galaxies in our universe apart instead of pulling them together. The nature of dark energy is one of the most important unsolved problems in all of science.

Explanation:

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Answer 2

Answer:

Dark matter makes up about 27%. The rest - everything on Earth, everything ever observed with all of our instruments, all normal matter

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. ... Up until the late 1990s, most cosmologists believed the universe did not have enough mass to cause a Big Crunch