>Air Force launches second mysterious space plane

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A second mysterious, robotic space plane was launched into orbit by the U.S. Air Force today, after the first craft safely returned to Earth late last year following a secretive months-long mission and speculation about its potential military or intelligence uses.

The second Boeing-built X-37B Orbital Test Vehicle, or OTV, left Cape Canaveral, Fla., at 2:46 p.m. PT, atop an Atlas V rocket, Boeing said.

“History was made in December when the X-37B became the United States’ first unmanned vehicle to return from space and land on its own,” Craig Cooning, vice president and general manager of Boeing Space and Intelligence Systems, said in a statement today. “The success of that mission validated this reusable and effective way to test new technologies in space and return them for examination.”