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Answer:
In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales.
Explanation:
The curve changes noticeably about 7.5 billion years ago, when objects in the universe began flying apart as a faster rate. Astronomers theorize that the faster expansion rate is due to a mysterious, dark force that is pulling galaxies apart. One explanation for dark energy is that it is a property of space