Sure, the Dragon V2 is the latest (and greatest) spacecraft from SpaceX, but its not the only capsule that may one day schlep astronauts to the International Space Station. In fact, Elon Musks firm is just one of three private outfits currently competing in a NASA program for commercial launches with their own vehicles. Weve surveyed the space capsule landscape and have whipped up a primer on the future crafts that may wind up taking humans to space.
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