[QUOTE="Idonomeus"][QUOTE="cjek"] Lets say that some aliens could travel at the speed of light.cjek
Just because humans think light is the fastest you can travel does not make it so. I mean we are talking about a peoples who thought the earth was flat not too long ago and could not even sail between the continents on our own planet. Anyway even if the theory that you can't travel faster than light is correct maybe you can fold space or something so you don't need to actual travel that fast to move distances.
According to the theory of relativity, to accelerate something beyond the speed of light requires infinite energy.. which in theory is not possible.
However.. you may win in this one. Einstein stated correctly that the closer to the speed of light you get, you travel forward in time faster (than you would if you were slower or stationary). GPS satellites lose 38,000 nanoseconds every day because of this, and if the problem wasn't accounted for, GPS systems would become 10km less accurate every day. If we could travel extremely fast, we'd obviously get there faster, but thanks to time dilation it wouldn't seem like such a long time for those on board. The people on board would experience a 25 year trip, while to us, observing from Earth, the trip actually took 50 years for example.
You don't understand what I'm saying. The key word is theory when we are talking about this kind of thing. Humans throughout history have thought they knew it all when they did not. Think about where we were a thousand years ago... ok now think that there could be civilization out there another million or more years ahead of where we are now. Even in the past few hundred years we have seen what was previously thought impossible done. There could be numerous ways to travel distances in space that don't involve you traveling fast in the conventional sense, such as folding space. However i doubt we have thought of such techniques (even in theory) and that is only one example based on the little we know at this point in time.
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