SpaceX on Saturday launched its first test of an unmanned Dragon vehicle which is designed to carry humans into low Earth orbit and to the International Space Station. If the test is successful, later this year, SpaceX plans to launch American astronauts from United States soil for the first time since 2011.
While a major milestone for a private company, SpaceX’s most significant achievement has been in lowering the launch costs that have limited many space activities. While making several modifications to the fuel and engines, SpaceX’s major breakthroughs have come through recovering and reusing as much of

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