1. Big black hole
NASA's Swift satellite has helped astronomers solve a decades long mystery about why a small percentage of black holes emit vast amounts of energy. According to NASA, only about 1% of supermassive black holes exhibit this energy behavior. The new findings confirm that black holes "light up" when galaxies collide, and the data may offer insight into the future behavior of the black hole in our own Milky Way galaxy. According to NASA, the intense emission from galaxy centers, or nuclei, arises near a supermassive black hole containing between a million and a billion times the sun's mass. Giving off as much as 10 billion times the sun's energy, some of these active galactic nuclei are the most luminous objects in the universe, including quasars and blazars.