DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Wormhole. Artwork of a wormhole. A wormhole is a tunnel through four-dimensional space-time linking one black hole to another located elsewhere. A black hole is a region of high gravity surrounding the remnants of a dead star. The gravitational pull is so strong that not even light can escape. Wormholes, which are legitimate solutions of Einstein's equations, could theoretically allow travel from one point to another either in a time direction (past-future) or in a space direction at a speed greater than that of light. Unfortunately, the life of a wormhole spans a tiny fraction of a second, making practical use impossible.
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