When a star collapses and becomes super dense, its gravity becomes so strong that light can't even escape. That is why it is black - no light. Although they are considered to be real, there is still room for debate on whether they really exist. That is still completely unknown. Wormholes are just theoretical constructs, and we are still not sure if the theories are correct.
Astronomical searchers are underway to look for evidence of wormholes , but nothing has been found.
We just recently confirmed that this vacuum fluctuation energy is real. Who knows if a parallel exists here. This is a noble and honorable cause, and I find it much more gratifying than designing weapons. That means you don't know what's going on, but it involves heat. Most evidence points to this being a dead end, but not all the evidence.