Scientists have created the most extensive map yet made of the distant universe, ten billion light years away. They’ve done so by measuring the shadows left by quasars, the brightest objects in the universe, according to astrophysicist David Schlegel of Lawrence Berkeley National Laboratory. He says that after the universe formed about 13.7 billion years ago, it started expanding. The force of gravity pulled galaxies together, which slowed it down. But 6 or 7 billion years ago, the expansion started accellerating again, possibly due to dark energy. More>
This research was also featured on the Department of Energy website.