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CAPE CANAVERAL, Florida - An unmanned Atlas rocket carrying a miniature space shuttle blasted off from Cape Canaveral Air Force Station on Thursday on a technology test flight that could last as long as nine months. The 20-story rocket, built by United Launch Alliance — a joint venture of Lockheed Martin and Boeing — lifted off at 7:52 p.m. ET and soared over the Atlantic Ocean, heading toward orbit. The Air Force Space Command, based in Colorado Springs, which will oversee the mission of the X-37B Orbital Test Vehicle, has classified details of the prototype shuttle's payload, experiments and planned orbital operations. Story continues below ↓advertisement | your ad here The point of the project, started by NASA in the late 1990s and later adopted by the military, is to test a next-generation space shuttle — the world's only reusable operational spaceship —to try to trim time between flights and cut costs, said Gary Payton, Air Force deputy undersecretary for space programs. "Probably the most important demonstration is on the ground, see what it really takes to turn this bird around and get it ready to go fly again," Payton told reporters. NASA's space shuttles take several thousand engineers and technicians three to four months to prepare for flight. But the X-37B is not meant to carry people. The military is looking at the vehicle as a way to test new equipment, sensors and materials in space, with an eye to incorporating them into satellites and other operational systems. Image: X-37B spacecraft AP This undated image from the U.S. Air Force shows the X-37B spacecraft, which was launched Thursday. Officials also would like to cut the turnaround time between space flights from months to days. The X-37B looks like a space shuttle orbiter, with a similar shape and payload bay for cargo and experiments. But it measures 29 feet, 3 inches in length and has a 15-foot wing span, compared to the 122-foot orbiters with wing spans of 78 feet. Unlike NASA's space shuttles which can stay in orbit about two weeks, X-37B is designed to spend as long as nine months in space, then land autonomously on a runway. "In all honesty, we don't know when it's coming back for sure," said Payton. "It depends on the progress that we make with the on-orbit experiments, the on-orbit demonstrations." Click for related content Air Force to launch unmanned space plane Air Force's space plane fuels speculation Cosmic Log: Spaceflight's past and future The vehicle is expected to land at Vandenberg Air Force Base in California, with nearby Edwards Air Force Base in the Mojave Desert available as a backup. The X-37B was built by Boeing's advanced research lab, Phantom Works. If the flight is successful, the Air Force plans to launch a second vehicle in 2011.