我强调这点的原因是为了让你们理解在合理的时间内抵达那里所需要的巨大能量.你不仅必须飞得很快 还要快到接近物理定律所允许的极限.为了达到那种速度 你消耗的能量将超过当今整个人类文明一年所用的能量（减速时也一样）.所以底线是：钱 一大笔钱.
Almost as fast as the absolute laws of physics perm it. And you have to use more energy to reach that speed (and then slow back down) than all of human civilization is currently using in a year.
现代文明依赖来自化石燃料的能源，但在一个消耗增加和资源减少的世界，化石燃料还可延续供应多久呢？
Modern civilization depends on energy from fossil fuels. But in a world of increasing consumption and decreasing resources, how long will fossil fuel supplies last?
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