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A Q-star, also known as a grey hole, is a hypothetical type of compact, heavy neutron star with an Exotic matter of matter. Such a star can be smaller than the progenitor star's Schwarzschild radius and have a gravitational pull so strong that some light, but not all light, can escape. Light going in the opposite direction of the Stellar core would be the most likely to escape from it, while light going in a direction almost parallel to its surface is the most likely not to escape. The Q stands for a conserved particle number. A Q-star may be mistaken for a stellar black hole.* Some stellar black holes might be grey holes, two of which are V404 Cygni and Cygnus X-1.
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