Unveiling the Mysteries of Dark Energy: Exploring the Universe's Expansion

Dark energy, a mysterious force driving the accelerating expansion of the universe, was discovered in the late 1990s. Its existence was inferred from observations of distant supernovae and is estimated to constitute about 68.3% to 70% of the universe. Scientists have proposed various theories to explain dark energy, including vacuum energy, quintessence, space wrinkles, and modifications to general relativity. To investigate further, NASA is involved in missions such as Euclid, the Nancy Grace Roman Space Telescope, and SPHEREx, as well as supporting the Vera C. Rubin Observatory, to map the universe and study dark energy, ushering in a new era of cosmological exploration.