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The nature of dark energy is more hypothetical than that of dark matter, and many things about it remain in the realm of speculation. [22] Dark energy is thought to be very homogeneous and not dense, and is not known to interact through any of the fundamental forces other than gravity.
The dark-energy star is a different concept from that of a gravastar. [ 2 ] Dark-energy stars were first proposed because in quantum physics , absolute time is required; however, in general relativity , an object falling towards a black hole would, to an outside observer, seem to have time pass infinitely slowly at the event horizon .
Since the 1990s, studies have shown that, assuming the cosmological principle, around 68% of the mass–energy density of the universe can be attributed to dark energy. [6] [7] [8] The cosmological constant Λ is the simplest possible explanation for dark energy, and is used in the standard model of cosmology known as the ΛCDM model.
Dark energy is one of the greatest mysteries in science today. One of the simplest explanations is that it is a “cosmological constant” – a result of the energy of empty space itself – an ...
To make that assumption work, astronomers have used the concept of dark energy. For a century, scientists have thought that the universe was expanding in all directions.
Voids have contributed significantly to the modern understanding of the cosmos, with applications ranging from shedding light on the current understanding of dark energy, to refining and constraining cosmological evolution models. The Milky Way Galaxy is in a cosmic void named the KBC Void. [35]
Dark star (Newtonian mechanics), a star that has a gravitational pull strong enough to trap light under Newtonian gravity; Dark star (dark matter), a star heated by annihilation of dark matter particles within it; Dark-energy star, an object composed of dark energy that outwardly resembles a black hole
Negative pressure is believed to be a property of vacuum energy, but the exact nature and existence of dark energy remains one of the great mysteries of the Big Bang. Results from the WMAP team in 2008 are in accordance with a universe that consists of 73% dark energy, 23% dark matter, 4.6% regular matter and less than 1% neutrinos. [ 42 ]