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Saturday night. A busy day is coming to an end and the motor and test stand are ready.
Photo by Thomas Pedersen
The Aerojet Rocketdyne RS-25, otherwise known as the Space Shuttle main engine (SSME), is a liquid-fuel cryogenic rocket engine that was used on NASA's Space Shuttle and is planned to be used on its successor, the Space Launch System. Designed and manufactured in the United States by Rocketdyne (later known as Pratt & Whitney Rocketdyne and Aerojet Rocketdyne), the RS-25 burns cryogenic liquid hydrogen and liquid oxygen propellants, with each engine producing 1,859 kN (418,000 lbf) of thrust at liftoff. Although the RS-25 can trace its heritage back to the 1960s, concerted development of the engine began in the 1970s, with the first flight, STS-1, occurring on April 12, 1981. The RS-25 has undergone several upgrades over its operational history to improve the engine's reliability, safety, and maintenance load. Subsequently, the RS-25D is the most efficient liquid fuel rocket engine currently in use.
Space Center Houston is the official visitor center of NASA Johnson Space Center and a Smithsonian Affiliate Museum owned and operated by the nonprofit Manned Spaceflight Education Foundation. The center opened in 1992 and hosts more than 1 million visitors annually in its 250,000-square-foot educational complex with over 400 space artifacts, permanent and traveling exhibits, attractions, live shows and theaters dedicated to preserving the history of America's human spaceflight program.
The Lyndon B. Johnson Space Center (JSC) is the National Aeronautics and Space Administration's Manned Spacecraft Center, where human spaceflight training, research, and flight control are conducted. Construction of the center, designed by Charles Luckman, began in 1962 and the 1,620-acre facility officially opened for business in September 1963. The center is home to NASA's astronaut corps, and is responsible for training astronauts from both the U.S. and its international partners. It has become popularly known for its flight control function, identified as "Mission Control" during the Gemini, Apollo, Skylab, Apollo–Soyuz, and Space Shuttle program flights. It is also the site of the former Lunar Receiving Laboratory, where the first astronauts returning from the Moon were quarantined, and where the majority of lunar samples are stored.