Back in the day, it was theorized that people would not be able (after a certain speed was achieved) to survive a ride on a locomotive! (something about not being able to breath air due to some silly physics or physiology).
Back in the day, man could not fly.
Back in the day (as mentioned on this thread) we couldn't break the sound barrier.
We're talking about a few hundred years of human technological barriers and intellectual breakthroughs.
If mankind can survive itself, in another few hundred years - we (in 2011) will be thought of as simpletons.
Can we even grasp the idea of infinity? Draw a straight line to that galaxy a trillion-billion light years from earth.......and then keep drawing another line a trillion-billion light years beyond that, and beyond that......etc, etc, etc, etc. Where does that straight line end? And what's beyond that???
Some say the universe is shaped like a donut. Well, a straight line will exit a curve, eventually - so what's outside the donut?
My point is - we can't imagine the possibilities of time, space, or physics based on what we "know" to be "absolute" or "mathematically possible" at this point in time.
Some say aliens do not exist because they cannot travel at such high speeds and with radical maneuvers - because the G-forces would kill them!
Yes........and "high speed" travel by locomotive will suck the air out of your lungs.