Tuesday, February 10, 2009
1. Space Shuttle Orbiter that first flew on Apr. 4, 1983 (STS-6). 2. Nickname of the Apollo 17 Lunar Module. 3. United States Navy research vessel that made a prolonged study of the Atlantic and Pacific Oceans between 1872 and 1876, and after which the two spacecraft were named. 
Among the milestones of the Orbiter Challengerwere the first spacewalk from a Shuttle (STS-6), the flight of the first American female astronaut (STS-7), the flight of the first African-American astronaut (STS-8), the first use of free-flying Manned Maneuvering Units during a spacewalk (STS-41B), and the first in-flight repair and redeployment of a satellite (STS-41C).
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