S97-01442 (August 1996) --- Dr. Reinhold Ewald, German Space Agency (DLR), cosmonaut researcher

European astronaut and professor, Institute of Space Systems, Reinhold Ewald, speaks during an astronaut panel discussion at the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

European astronaut and professor, Institute of Space Systems, Reinhold Ewald, speaks during an astronaut panel discussion at the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

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. Photo credit: (NASA/Aubrey Gemignani)

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. Photo credit: (NASA/Aubrey Gemignani)

Members of the astronaut panel discussion, from left to right, Roscosmos cosmonaut and executive director for piloted spaceflights, Sergey Krikalev; former NASA astronaut Leland Melvin; former NASA astronaut Mary Cleave; former NASA Administrator and astronaut, Charlie Bolden; former Cosmonaut Dumitru-Dorin Prunariu; ESA (European Space Agency) astronaut, André Kuipers; and European astronaut and professor, Institute of Space Systems, Reinhold Ewald, pose while the audience takes photos, at the conclusion of the event; during the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

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. Photo credit: (NASA/Aubrey Gemignani)

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 (not pictured); 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. Photo credit: (NASA/Aubrey Gemignani)