Comment Time Travel (Score 1) 361
If reverse time travel were possible it would have already happened in the future. Either we do not matter much to the inventors or they're too worried about changing their own past and vanishing, causing a global war, or preventing the invention of the sonic screwdriver.
So what I am wondering is: If you change the past, does the current time continue to happen in an alternate universe, or would it just change all of the events and update the same reality. Alternate universes would require an entire universe worth of energy to fork right? That has me leaning toward single reality updates. Unless that universe already existed and
Anyone read "The Dreaming Void?" Substitute universe with known-universe and you just need a gigantic simulator that eats galaxies when it needs to fork. They should've built in logrotate on that simulator BTW.