In March 2011, the U.S. Air Force launched the second test flight of the top secret X-37B space plane. Originally scheduled to land after 270 days, the mission was extended and the spacecraft was still in orbit at the end of 2011. The 2010 maiden flight of the X-37B lasted for 220 days. The military...
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The Authoritative Guide to Global Space Activity, Packed with Over a Decade of Data, Resources, and Information.
