Blackholes and wormholes are natural occurrences in space that humans have come to understand through math. Blackholes are created with an intense power of gravity at its center. To an object moving into a blackhole the force of gravity would feel very intense, however to an observer the object would approach a blackhole and eventually appear as if it stopped. This is called time dilation. There are a few theories and solutions that cover wormholes. For example the Einstien-Rosen Bridge solution suggests that traveling through a blackhole and exiting out another means the traveler cannot return to their original universe. However the Kip Thorne solution suggests that wormholes are traversable either way.
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