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Even at modest %'s of the speed of light objects start to radiate their energy away in Gravitational Waves. So it is very expensive to approach the speed of light when most of your effort is just radiated away.

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Q: Why do scifi spaceships always have a maximum speed of x percent for example 50 percent or 30 percent of the speed of light what stops them from accelerating to 99 percent without air resistance?
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