what is Dark Energy?
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In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales. ... The mass–energy of dark matter and ordinary (baryonic) matter contributes 26% and 5%, respectively, and other components such as neutrinos and photons contribute a very small amount.
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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. ... The universe is seen as expanding faster today than billions of years ago.
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