Time Travel

Your question runs afoul of "The Paradox": *if* your actions erased your own existence, then you would not exist to go back in time and erase yourself (unless of course there are multiple parallel time lines, in which case you would be safe no matter what you did).

i time travel every night, i close my eyes and when i open them again, it's the future (by about 6 hours)

Hollywood isn't a competent authority to determine anything at all about time travel. Anything figured out will be figured out by physicists.

Yes, I would go and kill Hitler, but only if I got to come back and resume something approximating my life.

I recall a read about a man that went to the past and could not return to his own time. Eventually, he had to reach the time when he was born. The question whether he could occupy the same time with himself was answered by the fact he had been in the past long enough for all his cells to be replaced. Therefore he was not the same person.

By asking this question you need to take in account every single paradox related to time travel - For example, if I travel back in time, and go on a viking onslaught, one of those vikings might happen to be my ancestor (I am Danish). Therefore, I will not be born to go back and kill him, ergo I will not have killed him, which makes me alive and able to go back, ergo I will have killed him, and so forth for hours on end.

Questioning time travel as a whole is a long shot, as it will (by the law of nature) never be possible. For you to travel time, you must be able to travel above the speed of light (as explained by special relativity) and seeing as that is not possible, nor is it for you to travel in time.

HOWEVER, hypothetically speaking, if I could go back I would not change a thing. I am well aware a lot of innocent people have died throughout time, but most of it has changed for the better. Besides, it really isn't my problem.

Please listen to me! You seem to be the only people who will belive me. I know how to time travel. My future self visited me and told me something only i know. Please belive me! I can help with the theory he told me about that makes sense! Please.

Someone I dearly loved died recently. In my grief, I wanted to go back in time. I never took physics but I do know the scientific theories of alternate universes and time travel, at least on a superficial level.

I think biology trumps physics. Time travel is impossible. Dead is dead and he is not only dead, he donated his body to science, volunteered to become a cadaver.

I wanted to go back to 1967 and to rework the forces that separated us. But that would plunge us back into Vietnam. Would the dead arise again, along with him? Would we have to experience another Nixon presidency? Another Challenger disaster? Another Christmas tsunami?

Besides, how does one hail a black hole? A black hole is not exactly a taxi that one can command.