Astrophysicists Envision a Universe Without Dark Energy

Dark energy, the hypothesized but unconfirmed entity thought to propel the expansion of the universe, has puzzled astrophysicists since the 1990s. Its subtle effects are even harder to detect directly than those of dark matter. Now some scientists are developing alternative ways to understand the universe's expansion and proposing to dispose of the concept of dark energy altogether. A portion of the Deep Field image from the Hubble Space Telescope, 1996. Data from Hubble, in which distant galaxi...