Scientists have been left baffled by a mysterious celestial object so bright that physics dictates it should have exploded. NASA has been tracking so-called ultraluminous X-ray sources, objects that can be 10 million times as bright as the sun, to understand how they work. These objects are impossible in theory because they break the Eddington limit, a rule of astrophysics that dictates an object can be only so bright before it breaks apart. A new study categorically confirms that M82 X-2, a ULX 12 million light-years away, is as bright as previous observation suggested. But the question remains: How can it exist? (READ MORE)

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