The Genesis I spacecraft, shown in this artist's rendering, was launched aboard a converted Russian Cold War ballistic missile. Tucson-based Paragon Space Development Corp. says it has supplied Bigelow Aerospace with pressure-control hardware for test flights.

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An experimental, inflatable spacecraft bankrolled by real-estate magnate Robert Bigelow rocketed into orbit Wednesday to test technology that could be used to fulfill his dream of building a commercial space station.

The Genesis I satellite flew aboard a converted Cold War ballistic missile from Russia's southern Ural Mountains. It was about 320 miles above Earth minutes after launch, according to the Russian Strategic Missile Forces.

The launch was a first for the startup Bigelow Aerospace, founded by Bigelow, who owns the Budget Suites of America hotel chain. Bigelow is among several entrepreneurs attempting to break into the fledgling manned commercial spaceflight business.

Tucson-based Paragon Space Development Corp. says it has supplied Bigelow with pressure-control hardware for test flights, including flights this year.

Mission controllers began communicating with Genesis about seven hours after liftoff. Early indication showed that the spacecraft was behaving as planned, according to a statement by the company. The spacecraft's internal battery was at full charge, meaning it had deployed its solar panels, the statement said.

Once the satellite's status is -confirmed, it will begin the tricky job of ballooning itself to twice its pre-launch width in a process that could last several hours.

Bigelow hopes to use inflation technology to build an expandable orbital outpost made up of several Genesislike modules strung together like sausage links that could serve as a space hotel, science lab or even a sports arena.

"We're ecstatic. We're just elated," Bigelow said in a telephone interview from Las Vegas. "We have a sense of being on a great adventure."

Bigelow has committed $500 million toward building a commercial space station by 2015. So far, $75 million has been spent on the project.

Because Wednesday's unmanned mission was experimental, Bigelow said he was prepared for problems.

The watermelon-shaped Genesis I is a one-third scale prototype of the commercial space station to which the company eventually hopes to fly humans.

Unlike the rigid aluminum international space station, Genesis I consists of a flexible outer shell and is layered with tough material such as Kevlar, which is used in bulletproof police vests, to withstand space debris.

The 2,800-pound Genesis I measured 14 feet long and 4 feet wide at launch and was to inflate to twice that width in orbit. It carried insects that scientists hope to study to determine how well they survive the flight.

Equipped with a dozen cameras to be aimed at the Earth, the spacecraft will circle the planet for at least five years while scientists study its durability.

Bigelow Aerospace plans to launch several prototypes this decade. Future missions will test docking among spacecraft, but the maiden Genesis flight will primarily focus on the inflation process.

In the 1990s, NASA studied inflatable technology for a possible trip to Mars, but later dropped the idea after deciding inflatable modules were too expensive. Bigelow Aerospace then licensed the technology from NASA.

This fall, the company hopes to launch Genesis II. Over the next several years, the company plans to test larger prototype spacecraft, including a full-scale mock-up slated to launch in 2012.