Air Force launches second robotic space plane

A second mysterious, robotic space plane was launched into orbit by the US Air Force on Saturday.

A second mysterious, robotic space plane was launched into orbit by the US Air Force on Saturday, after the first craft safely returned to Earth late last year following a secretive months-long mission.

The second Boeing-built X-37B Orbital Test Vehicle, or OTV, left Cape Canaveral, Florida 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," said Craig Cooning, vice president and general manager of Boeing Space and Intelligence Systems, in a statement. "The success of that mission validated this reusable and effective way to test new technologies in space and return them for examination."

The X-37B, which was originally a NASA project, has the potential to pick up where the space shuttle program will leave off when it winds down. But an Air Force statement at the time of the first craft's launch that a successful project could "make our access to space more responsive... and push us in the vector toward being able to react to warfighter needs more quickly", has, for some, lent the X-37B program an air of intrigue.

For more on this story, read Air Force launches second mysterious space plane on CNET News.