LIONEL BRET / EURELIOS / SCIENCE PHOTO LIBRARY LIONEL BRET / EURELIOS / SCIENCE PHOTO LIBRARY
Parallel universes. Artwork of a black hole (bottom) and a white hole (top) forming a passageway between parallel universes. The grids represent space-time, the unified view of space and time presented in Einsteinian physics. Normally, space-time is flat, but dense concentrations of mass warp space-time to form singularities (seen here as a funnel shape) known as black holes. Matter entering black holes (orange arrows) is thought to be crushed and destroyed, but in some theories the matter passes through the singularity and emerges into a parallel universe (or another region of our universe) from a structures known as a white hole (the opposite of a black hole).
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