Right, the faster you go, the less time you actually travel.
It's like this:
Ts = Tr * sqrt(1-v^2/c^2)
Ts = time felt in space as you travel with speed v
Tr = time felt while standing still or at a negligible speed
c = speed of light, ~2.997x10^8 m/s
Therefore, as you approach the speed of light, the time felt in space becomes negligible. But as others have said, ionic propulsion has a speed of about 25000 mph, ~11176 m/s.
Ts / Tr = sqrt(1 - (11176m/s)^2 / (2.997x10^8m/s)^2) = .99999999930
So, basically, 25000 mph or 11176 m/s is negligible. If you travel this speed, you will only feel .99999999930 times the amount of time a normal person feels. If someone lived 100000000000 years, you, traveling in space at 25000mph will have felt/lived 99999999930 years. The difference of which is only 70 years.
Basically, we have to travel really REALLY REALLLLLLLYYYY FAST in order to have some effect on the time we go through.
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