"With our current propulsion technologies, interstellar flight is impossible. Even with experimental technology, like ion thrusters or a spaceship’s aft pooping freaking nuclear explosions, it would require staggering amounts of fuel and mass to get to any nearby star. And worse: it will require decades — centuries, even — to get there. The trip will be meaningless for those left behind. Only the ones going forward in search for a new star system would enjoy the result of the colossal effort. It’s just not practical."
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