Something in outer space is breaking the law — the laws of physics, that is.
Astronomers call these lawbreakers ultraluminous X-ray sources (ULXs), and they exude about 10 million times more energy than the sun. This amount of energy breaks a physical law known as the Eddington limit, which determines how bright something of a given size can be. If something breaks the Eddington limit, scientists expect it to blow itself up into pieces. However, ULXs "regularly exceed this limit by 100 to 500 times, leaving scientists puzzled," according to a NASA statement.
