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is the designation of a still-classified U.S. military space project. Specifications or photos of the program have not been released to the public; as a result not much is known about its goals. It is believed to be a liquid fueled rocket upper stage capable of boosting a payload of up to 4,000 lb (1,800 kg) into Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
The Future Aircraft Technology Enhancements program is a program to develop new technologies. It is being run by the Air Force Research Laboratory and the Defense Advanced Research Projects Agency . The X-39 aircraft designation is reserved for use with FATE by the USAF.-References:***...
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X-41 is the designation for a still-classified U.S. military spaceplane. Specifications or photos of the program have not been released to the public yet; as a result not much is known about its goals...
|-References:* Miller, Jay. The X-Planes: X-1 to X-45. Hinckley, UK: Midland, 2001. ISBN 1-85780-109-1.-External links:* Day, Dwayne A. . centennialofflight.gov...
The Boeing X-45 unmanned combat air vehicle is a concept demonstrator for a next generation of completely autonomous military aircraft, developed by Boeing's Phantom Works. Manufactured by Boeing Integrated Defense Systems, the X-45 was a part of DARPA's J-UCAS project.-Development:Boeing developed...