Black holes and worm holes are two separate ordeals. Don't think of a black hole as something you can jump in and it might be a worm hole, you'd be very sorely mistake when you're ripped to death by tidal forces. Worm holes and white holes are mathematically objects. They would break the laws of physics, hence why we haven't detected them before, because they arguably don't exist. Like, a white whole exists in the same manner that entropy can decrease. You can contort math to say it can go both ways, but physically it can't. I will be fairly surprised if we ever find evidence of either these. It's important not to blend theoretical physics with actual physics. And a quark star is also theoretical, however it would not result in a black hole. neutron star>quark star>black hole As in neutron>quark>spacetime A quark is an elementary particle that makes up a hadron, like a neutron or a proton. A neutron star is formed when the core of a star is so big, the electron degeneracy pressure is exceeded, and everything falls onto the neutrons which hold it up. A black hole is when the neutron degeneracy pressure is exceeded. They're just theorizing that there may be a step in the middle of neutron star and black hole, where the quarks could hold the pressure.