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Just as a note on the Ion Drives: the reason they're so efficient (from what I've seen) is that they actually send the projected particles from the back and recollect them in the front. It's of course not a perfect system, but if it gave more thrust it would work very well.
I always like my high school physics professors idea: place a giant scoop in the front that collect the particles in space. the more collected the faster you can go and the faster you go the more you can collect. And there's no air resistance, so it would theoretically work.
I'm just hoping commercial space travel becomes a reality in my life-time.
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