When the lights went out in the universe http://www.cbsnews.com/news/when-the-lights-went-out-in-the-universe/ Great reading: What’s going on is dark energy. Totaling 69.2 percent of the energy density of the universe, it simply behaves … strangely. Dark energy’s most important property is that its density is constant. Its second most important property is that it appears to be tied to the vacuum of empty space.
Five billion years ago, a MYSTERIOUS FORCE overtook the universe. Hidden in the shadows, it lay dormant, buried underneath fields of matter and radiation. But once it uncovered itself, it worked quickly, bending the entire cosmos to its will. Five billion years ago, dark energy awoke.
