Question

what are Black holes?Did you beleive in the theory of time travel through black holes?

Answer 1

black holes an area in space that nothing, not even light, can escape from, because the force that pulls objects in space towards each other (gravity) is so strong there...
a black hole is also a region spacetim3 exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole...