The good news is that if someone went back and changed the past, then events would transpire such that they never had to go back in time for that reason, and so they wouldn’t., i.e. nothing would change. Not unless the whole exercise spins only the time traveler off into their own new universe in which they’re the only one with a memory of this alternative timeline from which they came.
The good news is that if someone went back and changed the past, then events would transpire such that they never had to go back in time for that reason, and so they wouldn’t., i.e. nothing would change. Not unless the whole exercise spins only the time traveler off into their own new universe in which they’re the only one with a memory of this alternative timeline from which they came.