Groping in the dark for clues to dark energy

Cosmologists Are Unable To Understand What Is Making The Galaxies Defy Cosmic Gravity Baltimore: Mario Livio tossed his car keys in the air. They rose ever more slowly, paused, shining, at the top of their arc, and then in accordance with everything our Galilean ape brains have ever learned to expect, crashed back down into his hand. That was the whole problem, explained Livio, a theorist at the Space Telescope Science Institute here on the Johns Hopkins campus.