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Katherine Megan McArthur is an American oceanographer, engineer, and a National Aeronautics and Space Administration astronaut. She has served as a Capsule Communicator for both the space shuttle and space station. Megan McArthur has flown one space shuttle mission, STS-125. She is known as the last person to be hands on with the Hubble Space Telescope via the Canadarm. McArthur has served in a number of positions including working in the Shuttle Avionics Laboratory. She is married to fellow astronaut Robert L. Behnken.