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"Some prophecies are self-fulfilling But I've had to work for all of mine Better times will come to me, God willing Cause I can't leave this world behind" -Josh Ritter You sure can't leave this world behind. At least, not very easily. The reason for it, of course, is gravity. Image Credit: Physclips, via the University of New South Wales' School of Physics. Here on the surface of the Earth, the gravitational potential well is pretty large; large enough that there's no easy way off. Sure, you can pour a huge amount of energy into a rocket to try and overcome this gravitational potential…