Bizarre object 10 million times brighter than the sun defies physics, NASA says
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.
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.
New observations published in The Astrophysical Journal from NASA's Nuclear Spectroscopic Telescope Array (NuSTAR), which sees the universe in high-energy X-rays, confirmed that one particular ULX, called M82 X-2, is definitely too bright. Prior theories suggested that the extreme brightness could be some sort of optical illusion, but this new work shows that's not the case — this ULX is actually defying the Eddington limit somehow.
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.
"A marshmallow dropped on the surface of a neutron star would hit it with the energy of a thousand hydrogen bombs," according to NASA.
The new study found that M82 X-2 consumes around 1.5 Earths' worth of material each year, siphoning it off of a neighboring star. When this amount of matter hits the neutron star's surface, it's enough to produce the off-the-charts brightness the astronomers observed.
The research team thinks this is evidence that something must be going on with M82 X-2 that lets it bend the rules and break the Eddington limit. Their current idea is that the intense magnetic field of the neutron star changes the shape of its atoms, allowing the star to stick together even as it gets brighter and brighter.
"These observations let us see the effects of these incredibly strong magnetic fields that we could never reproduce on Earth with current technology," lead study author Matteo Bachetti, an astrophysicist at the Cagliari Astronomical Observatory in Italy, said in the statement. "This is the beauty of astronomy … we cannot really set up experiments to get quick answers; we have to wait for the universe to show us its secrets."
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Briley Lewis (she/her) is a freelance science writer and Ph.D. Candidate/NSF Fellow at the University of California, Los Angeles studying Astronomy & Astrophysics. Follow her on Twitter @briles_34 or visit her website www.briley-lewis.com.
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Despite the tremendous energy it is putting out, that energy is attenuated by the inverse-square law, so that by the time this impossibly-bright light reaches us, it appears as nothing more than a bright point, to a powerful telescope.
There are many powerful objects and violent processes in space. But space is so immense, and things are so far apart, that Earth will likely be burnt to a cinder by the expanding Sun, before we are ever threatened by some passing neutron star.
No they are not. Neutron stars are created when a massive star goes supernova. The end state of Sun like stars are white dwarfs which are a different category of objects from neutron stars (white dwarfs are electron degenerate, neutron stars are neutron degenerate).
We are past due for any one of these cosmic events to transpire. Modern science is constantly surprised by the unexpected, and this is the rule of mortal beings.
The fact is that at any hour the earth could be affected by something completely unseen by scientists. Large enough to be cataclysmic to our paradigm. I humbly predict it will be a CME since the concern with our sun acting strangely is continuing and the eruptions emanating from its surface could just as easily produce a storm many times the magnitude of the Carrington Event of 1859.
I stick to a realistic scenario and this one is justifiable.