Answer: Something which violates the laws of physics as we know them.
I am stressing, of course, as we know them. When this happens, it means we don't know as much as we thought we did.
ULX's violate the Eddington limit, which determines how bright a cosmological object of a certain size can be. In theory, anything which violates that limit would explode.
The ULX they're looking at is a neutron star, and the theory is that the magnetic field of neutron stars holds them together even past that limit.
We're talking very strong magnetic fields here.
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