The X-37B, a secretive space plane developed by the defense Department, has shattered the space flight endurance record for these vehicle designs.
The Orbital Test Vehicle 3 (OTV-3) mission is the third long-endurance trip to space. The launch, payload, and data collected by the space plane are highly-classified.
An X-37B was launched on 11 December 2012, and remains in space. On 26 March, the craft surpassed the endurance record of 469 days, set by the same model of space plane on a previous mission.