This is in Off Topic because I can see the future. If I posted it in science or physics, people would be at each other's throats.
So, I watched a movie last night about time travel. Like most time travel sci-fi movies, it involved going back in time. I would like to separate science fiction from accepted science theory. I have read zero of the published works on the topic; basically all I know is what I've gleaned from what other people have said about it online.
The way I understand it (please, correct me if I'm wrong - that's what this thread is about), according to accepted scientific theory, time travel should be possible, but it should not be possible to actually go back in time. It should only be possible to proceed into the future at a different rate than "normal." The analogy I have created to describe it is as follows:
imagine 100 synchronized sky divers falling with their bodies parallel to the earth. They fall at their terminal velocity, which is equal, and can be described as the "normal" passage of time. Then one of them turns perpendicular to the earth and accelerates to a new terminal velocity which is faster than "normal" and so advances into the future ahead of the the others. This is your "time traveler." He can't reverse back up into the sky, back to where he was, as the passage of time is irreversible. He can only change the rate at which he advances into the future. He may even deploy his parachute and allow the others to catch up to him, but still cannot travel in a backward direction, only forward.
Is this close to what's described in accepted theory or do I have it all wrong? Should it be theoretically possible to go back in time?
So, I watched a movie last night about time travel. Like most time travel sci-fi movies, it involved going back in time. I would like to separate science fiction from accepted science theory. I have read zero of the published works on the topic; basically all I know is what I've gleaned from what other people have said about it online.
The way I understand it (please, correct me if I'm wrong - that's what this thread is about), according to accepted scientific theory, time travel should be possible, but it should not be possible to actually go back in time. It should only be possible to proceed into the future at a different rate than "normal." The analogy I have created to describe it is as follows:
imagine 100 synchronized sky divers falling with their bodies parallel to the earth. They fall at their terminal velocity, which is equal, and can be described as the "normal" passage of time. Then one of them turns perpendicular to the earth and accelerates to a new terminal velocity which is faster than "normal" and so advances into the future ahead of the the others. This is your "time traveler." He can't reverse back up into the sky, back to where he was, as the passage of time is irreversible. He can only change the rate at which he advances into the future. He may even deploy his parachute and allow the others to catch up to him, but still cannot travel in a backward direction, only forward.
Is this close to what's described in accepted theory or do I have it all wrong? Should it be theoretically possible to go back in time?