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KENNEDY SPACE CENTER, FLA. -- In this overhead view inside Orbiter Processing Facility 3 at Kennedy Space Center, technicians guide engine No. 3 toward the aft fuselage of Discovery for installation during processing for mission STS-120. Mission STS-120 will be the 23rd flight to the International Space Station. Space Shuttle Discovery will carry the U.S. Node 2. Launch is targeted for Oct. 20. NASA/Dimitri Gerondidakis