X-37B finally touches down, completing its not-so-secret classified mission

After more than a year of circling the globe, the US Air Force's X-37B has finally touched down at Vandenberg Air Force Base in California. The unmanned, reusable space plane spent 469 days in orbit, performing a number of experiments (many of which are classified) before finally ending its lengthy run Saturday. What exactly the military has learned from the extended orbital excursion is unclear, but, like the Mars rovers before it, the X-37B turned out to be far more robust than many had anticipated. Its mission was originally intended to last just nine months, but its operators managed to milk about six more months out of the craft. While we wait to find out what the next step is, enjoy the video of it landing after the break.