Distant ­supernovas (bright dots),
captured by NASA’s Hubble telescope,
open new vistas into the expansion
history of the early universe. As early
as 9 billion years ago, a mysterious
repulsive force known as dark energy
is seen exerting its influence.
Even weirder than dark matter—the invisible stuff constituting most of the mass of the universe—is dark energy, a mysterious force pushing the universe apart at an ever-faster rate. picked by rambler 1 year ago