At the Bigelow Aerospace factory here, the full-size space station  mockups sitting on the warehouse floor look somewhat like puffy white  watermelons. The interiors offer a hint of what spacious living in space  might look like.		
“Every astronaut we have come in here just says, ‘Wow,’ ” said Robert T. Bigelow, the company founder. “They can’t believe the size of this thing.”
 Four years from now, the company plans for real modules to be launched  and assembled into the solar system’s first private space station.  Paying customers — primarily nations that do not have the money or  expertise to build a space program from scratch — would arrive a year  later.		
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