Air Force's mysterious X-37B space plane survives first year in orbit

The U.S. Air Force's robotic X-37B space plane has celebrated a silent anniversary, surpassing an entire year in Earth orbit on a mystery mission for American military. Meanwhile, a third X-37B space plane mission is being readied, and could even launch later this year, SPACE.com has learned. (www.foxnews.com) 更多...