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USA 299



X-37B (USA 299), also known as the Orbital Test Vehicle (OTV), is a reusable robotic spacecraft. It is boosted into space by a launch vehicle, then re-enters Earth's atmosphere and lands as a spaceplane. While the X-37B's exact purpose is a secret, Space Force officials have revealed that the craft is packing numerous experiments on this trip to test out different systems in space. Some of those experiments include a small satellite called FalconSat-8, two NASA payloads designed to study the effects of radiation on different materials as well as seeds to grow food, and a power-beaming experiment using microwave energy.

Alternate Names

  • USA299
  • 45606
  • X-37B OTV-6

Facts in Brief

Launch Date: 2020-05-17
Launch Vehicle: Atlas V
Launch Site: Cape Canaveral, United States
Mass: 5400 kg

Funding Agencies

  • National Aeronautics and Space Administration (United States)
  • United States Air Force Academy (United States)


  • Other

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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