Didn't Einstein have a few theroies on this shit. That the faster you travel, time will slow down, and if we learn to travel faster then light, we can actually start going back in time...
I always thought it would be cool if we could shoot a camera in space fast enough to catch the light given off from earth from the last hundreds and thousands of years. If the camera was strong enough we could find out so many things, how we started, how the dinosaurs really died, who shot jfk....
We could even watch adam and eve go at it for the first time, bet he made a few mistakes first and fucked her in the butt a few times....
We could make a fortune selling that as porn on the web....