Dark Energy
Dark energy is a mysterious force that makes up about 68% of the universe and is believed to be responsible for its accelerated expansion. In the context of Einstein's theory of relativity, it acts like a repulsive energy that counteracts gravity, causing galaxies to move apart at an increasing rate. While we can't directly observe dark energy, its effects can be inferred from the behavior of distant galaxies and cosmic structures. Theoretical astrophysicists explore various models to understand dark energy's nature, but its true origin and properties remain one of the biggest questions in modern cosmology.
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Dark energy is a mysterious form of energy that permeates space and is believed to be responsible for the acceleration of the universe's expansion. Discovered in the late 1990s through observations of distant supernovae, dark energy constitutes about 68% of the universe. Unlike matter, which pulls objects together due to gravity, dark energy seems to push galaxies apart, counteracting gravitational forces. Its exact nature is still unknown, making it one of the biggest puzzles in modern cosmology. Understanding dark energy is crucial for comprehending the universe's fate and its underlying structure.