A black hole can become a portal to another part of the universe if you add negative energy. It's like turning a bottomless pit into a through-tunnel. Someday, such wormholes will let us travel between the stars.
🎯 Negative energy can be created in the lab using the Casimir effect: two metal plates in a vacuum attract each other because fewer virtual particles are born between them than outside.
🎬 In the film Interstellar, a wormhole is used for interstellar travel — exactly what scientists dream of.