The invention of the Manned Maneuvering Unit (MMU) 30 years ago enabled astronauts to maneuver within the payload bay or fly some distance away without needing safety tethers anchored to the vehicle. Join Matthew Hersch as he discusses this backpack propulsion device that gave astronauts mobility for extravehicular activities outside the Space Shuttle.

Meet at the Museum "Great Seal", in the Boeing Milestones of Flight Hall on the first floor.

About the Ask an Expert lecture series: Every Wednesday at noon in the National Mall Building, a Museum staff member talks to the public about the history, collection, or personalities related to a specific artifact or exhibition in the Museum.