70th International Astronautical Congress Former NASA astronaut Leland Melvin moderates a panel with former NASA Administrator and astronaut, Charlie Bolden; former NASA astronaut Mary Cleave, European astronaut and professor, Institute of Space Systems, Reinhold Ewald; Roscosmos cosmonaut and executive director for piloted spaceflights, Sergey Krikalev; and ESA (European Space Agency) astronaut, André Kuipers during the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington.

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