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The Boeing X-37 Orbital Test Vehicle, also known as the X-37B, is an unmanned spacecraft operated by the US Air Force. It is designed to perform a variety of classified, reusable space missions, including technology testing and demonstrations, space experimentation, and intelligence, surveillance, and reconnaissance.

The X-37B has a length of about 9 meters and a wingspan of 4.5 meters. It is launched into space on top of a rocket and can stay in orbit for up to two years. The spacecraft is equipped with solar panels that power its systems, and it can change its orbit and altitude using a propulsion system.

The X-37B has completed several missions since its first flight in 2010, with each mission lasting around a year or more. During these missions, the spacecraft has conducted experiments and tests on materials, sensors, and other technologies that can be used in future space missions. The exact nature of these experiments and missions are classified, and the spacecraft's activities are closely monitored by the US Air Force.