Random Facts #72 · 2:06am Apr 21st, 2017
Black holes have such a strong gravitational pull, that even light can't escape them.
There is evidence that there may be a star even denser than Neutron Stars - Quark Stars.
Quark Stars are theoretical stars that have such a high gravitational pull that the Neutrons normally found in a Neutron Star are further crushed down into the particles that make up neutrons. Namely, Quarks.