Dark energy and Dark Matter
Dark energy and Dark Matter Dark energy is one of the most intriguing and perplexing mysteries in modern astrophysics . It is a theoretical concept that attempts to explain why the universe is expanding at an accelerating rate , and it is thought to account for approximately 68% of the total energy density of the universe. First proposed in the late 1990s, dark energy is believed to be a repulsive force that is causing the universe to expand at an accelerating rate. The concept was first introduced to explain the observation that distant supernovae were fainter than expected , which suggested that the expansion of the universe was accelerating rather than slowing down as would be expected due to gravity. The exact nature of dark energy is still unknown , and scientists are working hard to try and understand it. One of the leading theories is that dark energy is associated with a field that permeates all of space, known as the cosmological constant . The cosmological constant w...