It may be a force or a form of energy, and one piece of evidence suggests it is hidden inside black holes.
Dark energy is an enigmatic phenomenon that acts in opposition to gravity and is responsible for accelerating the expansion of the universe. Though dark energy constitutes up to three-fourths of the mass-energy of the cosmos, its underlying nature has eluded physicists for decades. Dark energy has no real connections to dark matter, beyond sharing the word dark, which just means that scientists don't really know what these things are.
Nearly 60 years after Hubble's revelation, scientists made another startling discovery. Researchers had long been trying to precisely measure cosmic distances by looking at the light of faraway stars. In the late 1990s, after examining distant supernovas, two independent teams found that the stellar explosions' light is dimmer than expected. This indicates that the universe is not only expanding, but also accelerating in its expansion.
The leading explanations of dark energy suggests that it is a type of pent-up energy inherent in the fabric of space-time."This simple model works very well practically, and it is a straightforward addition to the cosmological model without having to modify the law of gravity," Baojiu Li, a mathematical physicist at Durham University in the United Kingdom, previously told Live Science.
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