Dark energy is the name given to the force that is believed to be making the universe larger(broader). Distant galaxies appear to be moving away from us at high speed,the idea is that the universe is getting bigger and has been since the Big Bang(hope u know)
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Dark energy is an unknown form of energy which is present in the universe and which is responsible for the expanding of universe. scientists are working and doing many researches to know what exactly is dark is believed that this dark energy is present every where in the universe.

hope this helps u.
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