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nomadreid
Gold Member
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In Kip Thorne’s “Black Holes and Time Machines”, he outlines objections to using traversable wormholes, if they existed, as time machines, the main one being (roughly) that radiation could also time travel, and mount up to destroy the wormhole. But isn’t another objection the conservation of mass-energy? A photon could go back in time to meet itself from the past, suddenly giving two photons where there was only one.