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On his first space flight, Richards was pilot on the crew of STS-28 which launched from Kennedy Space Center, Florida, on August 8, 1989. The mission carried Department of Defense payloads and a number of secondary payloads. After 80 orbits of the Earth, this five-day mission concluded with a dry lakebed landing on Runway 17 at Edwards Air Force Base, California, on August 13, 1989. Mission duration was 121 hours, 9 seconds.
Slightly more than one year later, Richards commanded the crew of STS-41. The five-man crew launched aboard the Space Shuttle Discovery on October 6 from the Kennedy Space Center, Florida, and landed at Edwards Air Force Base, California, on October 10, 1990.
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During 66 orbits of the Earth, the STS-41 crew successfully deployed the Ulysses spacecraft, starting this interplanetary probe on its four-year journey, via Jupiter, to investigate the Polar Regions of the Sun.
In June 1992, Richards commanded the crew of STS-50 aboard the Space Shuttle Columbia. STS-50 was the first flight of the United States Microgravity Laboratory and the first extended duration Orbiter flight. Over a two-week period, the STS-50 flight crew conducted a wide variety of experiments relating to materials processing and fluid physics in a microgravity environment. At that time it was the longest Space Shuttle flight in history.
In September 1994, Richards commanded the STS-64 crew aboard the Space Shuttle Discovery. Mission highlights included: the first use of a space based laser for environmental research; deployment and retrieval of a spacecraft in support of solar wind and corona studies; robotic processing of semiconductors; maneuvering the robotic arm in close proximity to over 100 Shuttle reaction control system jet firings to measure forces imparted to a plume detection instrument in support of future Space Station/Shuttle rendezvous flights; first untethered space walk in 10 years to test a self-rescue jetpack. Mission duration was 10 days, 22 hours, 51 minutes.
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