Dark Energy

Dark energy is a mysterious form of energy that is hypothesized to permeate all of space and is responsible for the accelerated expansion of the universe. It is thought to make up about 68% of the total energy content of the cosmos. Unlike ordinary matter and dark matter, dark energy does not clump together under the influence of gravity. Instead, it exerts a repulsive force that counteracts gravitational attraction on a cosmic scale, leading to the acceleration of galaxies moving apart from each other. The exact nature of dark energy remains one of the biggest unsolved problems in cosmology and physics, with various theories, including the cosmological constant, dynamic fields, and modifications to general relativity, proposed to explain its properties and effects.