Add Yahoo as a preferred source to see more of our stories on Google. Astronomers have to use indirect evidence, like the explosions of Type Ia supernovae, to investigate the impacts of dark energy.

Dark energy—the term used to describe whatever is causing the universe to expand at an increasing rate—is one of the universe's greatest mysteries. The most widely accepted theory currently suggests ...

For a quarter century, cosmologists have treated dark energy as a fixed, featureless pressure that steadily drives galaxies apart. Now a convergence of massive sky surveys and giant computer models is ...