宇宙学

2019 August 4 Rumors of a Dark Universe Image Credit: High-Z Supernova Search Team, HST, NASA Explanation: Twenty-one years ago results were first presented indicating that most of the energy in our universe is not in stars or galaxies but is tied to space itself. In the language of cosmologists, a large cosmological constant — dark energy — was directly implied by new distant supernova observations. Suggestions of a cosmological constant were not new — they have existed since the advent of modern relativistic cosmology. Such claims were not usually popular with astronomers, though, because dark energy was so unlike known universe components, because dark energy’s abundance appeared limited by other observations, and because less-strange cosmologies without a signficant amount of dark energy had previously…