#Dark #energy is #cosmology's biggest #mystery—an anti-gravitational force that confounds the conventional laws of #physics. It makes up more than two-thirds of the #cosmos, but #science is still grappling to explain what dark energy actually is. Watch our full program (link in profile) to hear top #physicists search for clues to this mystery in both the earliest moments of the #universe and far into the future of the cosmos. #WSF15 #darkenergy #lawrencekrauss #space #gravity