After the Moon Landing of 1969, manned space travel stagnated for over half a century. The space shuttle was far too expensive and never lived up to expectations. It was only with the advent of private space exploration that the cost of transporting a kilogram of payload into space fell dramatically. In fact, it now costs Elon Musk only around three percent as much to transport one kilogram into space as it used to cost NASA with the Space Shuttle.
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