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How many years will it be until we are capable of time travel into the past?
Assume humans dont go extinct first.
@freemo You can't come out the other end of a machine that doesn't exist yet.
@LouisIngenthron That makes the assumption that a machine must exist on the receiving end at all.
Two counter possibilities... 1) your timemachine moves through time with you, like a car it doesnt need to exist at your destination 2) it "throws" you into the past, you just land there, with no machine anywhere to be seen. A bit like getting shot out of cannon.
@freemo The delorean method, maybe, but the terminator method seems exceedingly unlikely.
Even so, the only way it could possibly exist is with each travel backward forming a new timeline.
If there was only one timeline, then time travelers in our past or present would definitely leave some pretty obvious clues (hyper-resistant future illnesses, for one), even before you consider the timeless human need to be a shithead.
