This is an awesome show about an alien (who conveniently looks like a human and can change his body) who travels through time and space in his TARDIS. The TARDIS (Time And Relative Dimension In Space) can take him anywhere and anywhen in the universe. Except that he can't go to parallel universes (unless some weird stuff happens), and he has to stay away from some things (e.g., the 1980's). He told us himself that time is not a linear progression of events. It is in fact "a great big ball of wibbly-wobbly, timey-wimey... stuff". That means that all the events are sort of mushed together and occurring at once. We just happen to travel forwards through a certain set of events at a certain rate. We also know that there are fixed points and "Crossing into established events is strictly forbidden. Except for cheap tricks." But there are also temporal tipping points where anything can happen. So go explore and have fun through all of time and space!
Time Travel According to Connie Willis
If you haven't read Connie Willis' time travel books, I highly recommend them. In these books (set in the future), Oxford University has gained the power to travel through time. Historians go back in time to see how accurate the history books really are. They have to blend in and try not to change any major events. Technicians send the historians back and then get a "fix" on the historians' coordinates, both location and time. They then open up the "net" at the specified time at the "fix" to retrieve the historians. There are two kinds of "drops". In a "real-time drop", time passes for both sides equally. If the historian is gone for a week, he/she comes back to the future a week after he/she left. In a "flash-time drop", the historian comes back to the exact time he/she left, regardless of how long he/she has been gone. Either way, it's pretty awesome.
Time Travel According to Back To The Future
This movie features a DeLorian (an old, expensive car) that can travel through time. You simply set the flux capacitor to the date you want, and you drive into the past (or the future). You have to watch out and be careful not to change important events. No killing your grandfather (or stopping your parents from meeting). If you do mess things up, you'll have to find some way to fix them. So hop in the DeLorian for a wild ride!
Time Travel According to Science
Yes, science does account for time travel. Check out http://en.m.wikipedia.org/wiki/Time_travel to learn more. The only part of it that really makes sense to me is this:
If you travel faster than the speed of light, you travel faster than the rest of the universe, so you go forward. Though, technically speaking, we all travel forward in time. Anyway, good luck time traveling!
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