NASA mysterious signal: Detected by two NASA spacecraft, X-ray emissions of unknown origin could lend insight into dark matter, a mysterious substance thought to compose more than 80 percent of all matter in the known universe.
Scientists have found three supermassive black holes crowded into the same neighborhood. It's a rare sight that tests Einstein's theories and could lead to one of the black holes being hurled into intergalactic space.
An Alaska earthquake touched off a small tsunami and was followed by dozens of aftershocks felt in Alaska's Aleutian Islands. Originally measured as a magnitude 8.0, the earthquake has been downgraded to 7.9.
Physicists at CERN have discovered new evidence supporting the existence of the Higgs boson, which seems to behave exactly as the Standard Model predicted it would. So what's left for particle physics to uncover?