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Some astronomers, Hailey and his co-authors among them, postulate that the distinction can be made by carefully monitoring the timing of an x-ray binary’s outbursts.

X-ray binary systems containing a black hole, they argue, would flare less frequently than others harboring a neutron star.

It may be impossible to tell from looking solely at x-ray emissions if an x-ray binary system contains a black hole or an imposter neutron star.

According to NASA, the glowing object turned out to be a newly flaring black hole X-ray binary.

First superburst from a classical low-mass X-ray binary transient.