The grandfather paradox illustrates a fundamental logical contradiction in backward time travel: if you travel back and kill your grandfather before your parent is conceived, you would never be born, meaning you couldn't have traveled back to kill him. Stephen Hawking proposed that the universe physically blocks backward time travel through his chronology protection conjecture, which suggests that while the mathematics of physics may allow time travel, reality itself prevents it to protect cause and effect from collapsing permanently.
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Why Grandfather Paradox Has No SolutionAdded:
Kill your grandfather and you erase the person who kills him. This loop has no exit and physics has never solved [music] it. Travel back before your father exists and eliminate your grandfather. You are never born, but if you never exist the trip never happens so he survives and you are eventually born again. Stephen Hawking believed the universe [music] physically blocks backward time travel precisely to protect cause and effect from collapsing [music] permanently. The math allows the journey, but reality refuses to permit it. But if the universe blocks time travel, what is actually stopping it?
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