A bizarre 'ultraluminous X-ray source' shines millions of times brighter than the sun, breaking a physical law called the Eddington limit, a new study finds.
Astronomers call these lawbreakers ultraluminous X-ray sources , 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 .
Astronomers used to believe ULXs could be black holes, but M82 X-2 is an object known as a neutron star. Neutron stars are the leftover, dead cores of stars like the sun. A neutron star is so dense that the gravity on its surface is about 100 trillion times stronger than that of Earth. This intense gravity means that any material pulled onto the dead star's surface will have an explosive effect.
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