Since NASA retired its space shuttle program, there has been a big, rocket-sized hole in our hearts. Several private companies like Virgin Galactic are trying to fill that void, but Elon Musk's Space X is really leading the way right now. Back in May of this year, Space X docked their Dragon spacecraft with the International Space Station, and over the weekend Musk tweeted photos and videos of a test flight of the new Grasshopper, their reusable rocket engine.
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