After seven months in space, the U.S. Air Force's secretive X-37B unmanned space plane returned to Earth today to wrap up a debut flight shrouded in secrecy.

The robotic X-37B space plane landed at Vandenberg Air Force Base in California to end its maiden voyage. The space plane, also known as Orbital Test Vehicle 1, glided back to Earth over the Pacific Ocean before landing at the revamped Vandenberg runway at about 1:16 a.m. PST (0916 GMT) today (Dec. 3).