Broadway performs are seen as they sing during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Students raise their hands to ask a question during a STEM day session at the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, in Washington. Photo Credit: (NASA/Bill Ingalls)

Local students view a model of NASA’s Gateway spacecraft while visiting the NASA exhibit at the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, in Washington. Photo Credit: (NASA/Joel Kowsky)

Broadway performers are seen as they sing during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Leon Harris, master of ceremonies, welcomes attendees to the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Students raise their hands to ask a question during a STEM day session at the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, in Washington. Photo Credit: (NASA/Bill Ingalls)

John Langford, President of the American Institute of Aeronautics and Astronautics (AIAA), delivers remarks during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Ken Bowersox, acting Associate Administrator for NASA's Human Exploration and Operations Mission Directorate, speaks about NASA’s Moon to Mars Exploration Plans during a keynote at the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

An audience member takes a photo as NASA Administrator Jim Bridenstine speaks during a multilateral meeting of the heads of space agencies at the 70th International Astronautical Congress, Tuesday, Oct. 22, 2019 in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Chief Scientist Jim Green speaks about NASA Science under the National Space Exploration Campaign during a keynote at the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA astronaut Alvin Drew talks about his time in space at a STEM day session with students during the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Doug Wheelock talks about his time in space at a STEM day session with students during the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Jeanette Epps talks about her training as at a STEM day session with students during the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA Administrator and astronaut, Charlie Bolden 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 Administrator and astronaut, Charlie Bolden 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 Mary Cleave 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)

ESA (European Space Agency) astronaut, André Kuipers, 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)

Vice President Mike Pence delivers remarks during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Jim Bridenstine speaks during the Heads of Agency Plenary of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA's Kristen Erickson speaks about educational science resources during the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine is seen as he tours the exhibit hall at the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA's Kristen Erickson speaks about educational science resources during the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine is seen as he tours the exhibit hall at the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Attendees pick up NASA bags at the agency’s exhibit at the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

The back wall of the NASA exhibit is seen during the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Vice President Mike Pence delivers remarks during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Jim Bridenstine is seen as he tours the exhibit hall at the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Attendees are seen by the NASA exhibit at the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

A model of the inside of Orion is seen at the NASA exhibit during the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

A model of the Gateway is seen at the NASA exhibit during the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Visitors to the NASA exhibit at the 70th International Astronautical Congress take a picture in a mockup of a space suit, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Jim Bridenstine speaks during the Heads of Agency Plenary of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

A model of NASA’s Space Launch System rocket is seen in the agency’s exhibit at the 70th International Astronautical Congress, Friday, Oct. 25, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Vice President Mike Pence delivers remarks during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Vice President Mike Pence delivers remarks during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Broadway performers are seen on stage during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Vice President Mike Pence delivers remarks during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

A model of Orion is seen at the NASA exhibit during the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Visitors to the NASA exhibit at the 70th International Astronautical Congress view a cutaway model of the agency’s Orion spacecraft, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Former NASA astronaut Bob Curbeam spoke about his time in space at a STEM day session with students during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Former NASA astronaut Garrett Reisman talks about his time in space at a STEM day session with students during the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, in Washington. Photo Credit: (NASA/Bill Ingalls)

Roscosmos cosmonaut and executive director for piloted spaceflights, Sergey Krikalev, 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)

NASA astronaut Doug Wheelock, speaks about his time in space at a STEM day session with students during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Former NASA astronaut Janet Kavandi speaks about her time in space at a STEM day session with students during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Former NASA astronaut Frank Culbertson, speaks about his time in space at a STEM day session with students during the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, in Washington. Photo Credit: (NASA/Bill Ingalls)

Jean-Yves Le Gall, President of International Astronautical Federation (IAF), delivers remarks during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Philippe Étienne, French Ambassador to the U.S. speaks to Joseph Williams about virtual reality viewers at the NASA exhibit during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Swedish National Space Agency Director General, Anna Rathsman, speaks to NASA Administrator Jim Bridenstine during a multilateral meeting of the heads of space agencies at the 70th International Astronautical Congress, Tuesday, Oct. 22, 2019 in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Bill Nye, Chief Executive Officer, The Planetary Society, speaks during a session titled, “Europa Clipper: Making a Mission to Understand Our Place in the Universe” at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

An attendee takes a selfie with an RS-25 engine, the same type that will power NASA's Space Launch System, while visiting the NASA exhibit space at the 70th International Astronautical Congress, Tuesday, Oct. 22, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

A student asks NASA Administrator Jim Bridenstine a question during a Heads of Agency interactive session at the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

A baby in a flight suit sits in front of the Artemis sign at the NASA exhibit during the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Giorgio Saccoccia Head of the Italian Space Agency (ASI), speaks with NASA Administrator Jim Bridenstine before the signing of a joint statement at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 in Washington. Photo Credit: (NASA/Joel Kowsky)

Bill Nye, Chief Executive Officer, The Planetary Society, speaks during a session titled, “Europa Clipper: Making a Mission to Understand Our Place in the Universe” at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

S. Somanath, Director of Vikram Sarabhai Space Centre, Indian Space Research Organization (ISRO), speaks during the Heads of Agency Plenary of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Hiroshi Yamakawa, President of the Japan Aerospace Exploration Agency (JAXA), speaks during the Heads of Agency Plenary of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Lindsay Aitchison, Deputy Project Manager for the Advanced Space Suit Project at NASA speaks to visitors to NASA’s exhibit at the 70th International Astronautical Congress, Friday, Oct. 25, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA Deputy Administrator Jim Morhard is seen along side NASA Administrator Jim Bridenstine during a meeting with Sylvain Laporte, President of the Canadian Space Agency, at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 in Washington. Photo Credit: (NASA/Joel Kowsky)

Austrailian Space Agency (ASA) Deputy Head, Anthony Murfett, speaks to NASA Administrator Jim Bridenstine during a multilateral meeting of the heads of space agencies at the 70th International Astronautical Congress, Tuesday, Oct. 22, 2019 in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Sergey Krikalev, Executive Director for Piloted Spaceflights for Roscosmos, is seen during the Heads of Agency press conference at the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Johann-Dietrich Woerner, Director General of ESA (European Space Agency), speaks during the Heads of Agency Plenary of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Jim Bridenstine delivers remarks introducing Vice President Mike Pence during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Thomas Zurbuchen, Associate Administrator of NASA's Science Mission Directorate, left, speaks with Hansjörg Dittus, Executive Board Member for Space Research and Technology at the German Aerospace Center (DLR) during a meeting at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 in Washington. Photo Credit: (NASA/Joel Kowsky)

Panelists are seen during a discussion titled “ISS-Moon-Mars: Using Spaceflight Platforms to Study and Simulate Future Missions” during the the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Audience members participate in a special session titled ”The Immortal Spaceship: A Discussion on the Use Cases and Value of Persistent Platforms” at the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA Chief Scientist Jim Green is seen during a special session titled “Planetary Protection for the Future: Science, Exploration, and Commerce” at the 70th International Astronautical Congress, Thursday, Oct. 24, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Buzz Aldrin, Apollo 11 lunar module pilot, salutes as he is recognized by Vice President Mike Pence during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Audience members participate in a special session titled ”The Immortal Spaceship: A Discussion on the Use Cases and Value of Persistent Platforms” at the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Philippe Étienne, French Ambassador to the U.S., tries virtual reality viewers at the NASA exhibit during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Lisa Pratt, NASA's Planetary Protection Officer, answers a question from the audience during a special session titled “Planetary Protection for the Future: Science, Exploration, and Commerce” at the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Pascale Ehrenfreund, Chair of the Executive Board of the German Aerospace Center (DLR) is seen during a meeting with NASA Administrator Jim Bridenstine, Deputy Administrator Jim Morhard and other senior NASA leaders at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 in Washington. Photo Credit: (NASA/Joel Kowsky)

Brad Bailey, program scientist with NASA's Lunar Discovery and Exploration Program is seen during a keynote titled “An Overview of NASA’s Lunar Science Exploration Plans for Artemis” at the 70th International Astronautical Congress, Tuesday, Oct. 22, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

David Folta, a Flight Dynamics Engineer at NASA’s Goddard Space Flight Center, is seen during a keynote titled “Astrodynamics of Lunar and Cis-Lunar Missions” at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Andrew Klesh, a Mission Architect at NASA’s Jet Propulsion Laboratory is seen during a keynote titled “MarCO: Flight Results from the First Interplanetary CubeSat Mission” at the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

NASA Administrator Jim Bridenstine delivers remarks introducing Vice President Mike Pence during the opening ceremony of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

David Folta, a Flight Dynamics Engineer at NASA’s Goddard Space Flight Center, is seen during a keynote titled “Astrodynamics of Lunar and Cis-Lunar Missions” at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Aubrey Gemignani)

An RS-25 engine, the same type that will power NASA’s Space Launch System, is seen in the agency’s exhibit at the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Thomas Magner, Manager, Applied Physics Laboratory (APL), speaks during a session titled, “Europa Clipper: Making a Mission to Understand Our Place in the Universe” at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

NASA's Kristen Erickson holds up a braille image of the NASA logo and the moon during a talk about educational science resources at the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

David Folta, a Flight Dynamics Engineer at NASA’s Goddard Space Flight Center, is seen during a keynote titled “Astrodynamics of Lunar and Cis-Lunar Missions” at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Aubrey Gemignani)

Sergey Krikalev, Executive Director for Piloted Spaceflights for Roscosmos, is seen during the Heads of Agency Plenary of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Sergey Krikalev, Executive Director for Piloted Spaceflights for Roscosmos, speaks during the Heads of Agency Plenary of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Brad Bailey, program scientist with NASA's Lunar Discovery and Exploration Program is seen during a keynote titled “An Overview of NASA’s Lunar Science Exploration Plans for Artemis” at the 70th International Astronautical Congress, Tuesday, Oct. 22, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Lisa Pratt, NASA's Planetary Protection Officer, answers a question from the audience during a special session titled “Planetary Protection for the Future: Science, Exploration, and Commerce” at the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Andrew Klesh, a Mission Architect at NASA’s Jet Propulsion Laboratory is seen during a keynote titled “MarCO: Flight Results from the First Interplanetary CubeSat Mission” at the 70th International Astronautical Congress, Friday, Oct. 25, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Bill Nye, Chief Executive Officer, The Planetary Society, speaks during a session titled, “Europa Clipper: Making a Mission to Understand Our Place in the Universe” at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Audience members participate in a special session titled ”The Immortal Spaceship: A Discussion on the Use Cases and Value of Persistent Platforms” at the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Photos of people who have visited the NASA exhibit are placed on the Artemis sign during the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 at the Walter E. Washington Convention Center in Washington. Photo credit: (NASA/Aubrey Gemignani)

Simonetta Di Pippo, Director of the United Nations Office for Outer Space Affairs, is seen during a special session titled “Planetary Protection for the Future: Science, Exploration, and Commerce” at the 70th International Astronautical Congress, Thursday, Oct. 24, 2019, at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Joel Kowsky)

Portugal Space Agency President, Dr. Chiara Manfletti, speaks to NASA Administrator Jim Bridenstine during a multilateral meeting of the heads of space agencies at the 70th International Astronautical Congress, Tuesday, Oct. 22, 2019 in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Deputy Administrator Jim Morhard, left, and NASA Administrator Jim Bridenstine meet with Giorgio Saccoccia Head of the Italian Space Agency (ASI), before the signing of a joint statement at the 70th International Astronautical Congress, Wednesday, Oct. 23, 2019 in Washington. Photo Credit: (NASA/Joel Kowsky)

Professor Johann-Dietrich Worner, Director General of ESA (European Space Agency), reacts to something NASA Administrator Jim Bridenstine said during the 70th International Astronautical Congress, Tuesday, Oct. 22, 2019 in Washington. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Jim Bridenstine answers a question during the Heads of Agency Plenary of the 70th International Astronautical Congress, Monday, Oct. 21, 2019 at the Walter E. Washington Convention Center in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA Administrator and astronaut, Charlie Bolden, right, reacts to something former NASA astronaut Mary Cleave says, 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 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)

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)

Roscosmos cosmonaut and executive director for piloted spaceflights, Sergey Krikalev speaks to former NASA Administrator and astronaut, Charlie Bolden during an astronaut and cosmonaut 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)

ESA (European Space Agency) astronaut, André Kuipers 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)

NASA Administrator Jim Bridenstine speaks during a multilateral meeting of the heads of space agencies at the 70th International Astronautical Congress, Tuesday, Oct. 22, 2019 in Washington. Photo Credit: (NASA/Aubrey Gemignani)