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

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