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OCR: WORMHOLES Black hole IN THEORY A WORMHOLE is a black hole so massive that it curves space-time in on itself, opening out in another place and time in the Universe - or perhaps even in another universe altogether. It may be possible to build a time-traveling machine using a wormhole, but most physicists say that it would be Our impossible to travel back to a time universe before the machine itself was created. Connecting SINGULARITY wormhole A wormhole is an example of a Other universe singularity, a region of space-time where the ordinary laws of physics cease to apply.