Dark Energy Measurement Sheds New Light on Universe's Expansion

Dark Energy Measurement Sheds New Light on Universe's Expansion: "By combining their observations of galaxy clusters with other cosmological data, the scientists made the most precise dark energy measurements to date. The new measurements are consistent with the simplest model, in which dark energy is a "cosmological constant"—an energy field that is uniform throughout space and time. The idea of a cosmological constant was introduced by Albert Einstein in 1917, but soon fell out of favor. "