Will time travel ever be possible?
Conventional wisdom and most physicists say no. Go to sleep and wake up in the future. That is probably the closest thing to time travel we have. We can see into the past because of the limitations of the speed of light. It takes time to travel huge distances. So we can see the past by looking at the light that has traveled across space from objects far away. Conceivably we could travel faster than the speed of light to a point and then look back and see our past. But that is a completely different problem. The grandfather paradox is often used as an argument against time travel. Say you decide to kill your grandfather because he abused your grandmother and so you figure out how to travel back in time to stop him from doing so. But if you succeed in killing him, or even stopping him from having the relationship, then your father would never have been born and you could never have been born. Time travel, at least in the manner shown in movies like the Time Machine, The Twelve Monkeys, a
