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The Air Force is known to possess two X-37B vehicles, each of which was built by Boeing. The 29-foot-long space planes launch vertically and land horizontally, just like the space shuttle used to do.
The US X-37B and China's Shenlong are competing unmanned space planes whose covert missions are getting more complex. See how the spacecraft compare.
Boeing's X-37B, an unmanned and highly advanced space plane, just completed a nearly-two-long year Air Force mission whose purpose is still not currently known. Whatever its mission, the plane ...
The U.S. Air Force's unmanned X-37B space plane has now circled Earth for more than 400 days on a hush-hush mission that is creeping closer and closer to the vehicle's orbital longevity record.
The X-37 Orbital Test Vehicle (OTV) began life under the umbrella of NASA, but was passed to the US military, which created the X-37B variant. That model first flew in orbit in 2010 and the two ...
X-37B sits on the runway following the successful completion of the OTV-6 mission, which lasted a record 908 days. [Courtesy: U.S. Space Force] Yet X-37B is only one-fourth as large, about the ...
The X-37B has winged past 666 days of flight on this latest mission, which is called OTV-5 because it's the fifth flight for the program. ... model rockets, drones and more.
The US X-37B and China's Shenlong are competing unmanned space planes whose covert missions are getting more complex. See how the spacecraft compare.
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