NASA astronauts Bob Behnken and Doug Hurley are met by NASA Administrator Jim Bridenstine
 and Kennedy Space Center Director Bob Cabana after they arrived at the Kennedy Space Center to prepare for the launch of SpaceX's Crew Dragon capsule, at Cape Canaveral, Florida, U.S. May 20, 2020. REUTERS/Joe Skipper

NASA astronauts Bob Behnken and Doug Hurley pose with NASA Administrator Jim Bridenstine
 and Kennedy Space Center Director Bob Cabana after they arrived at the Kennedy Space Center to prepare for the launch of SpaceX's Crew Dragon capsule, at Cape Canaveral, Florida, U.S. May 20, 2020. REUTERS/Joe Skipper

NASA Administrator Jim Bridenstine
 speaks after the arrival of NASA astronauts Bob Behnken and Doug Hurley at the Kennedy Space Center to prepare for the launch of SpaceX's Crew Dragon capsule, at Cape Canaveral, Florida, U.S. May 20, 2020. REUTERS/Joe Skipper

NASA astronauts Bob Behnken and Doug Hurley pose after they arrived at the Kennedy Space Center to prepare for the launch of SpaceX's Crew Dragon capsule, at Cape Canaveral, Florida, U.S. May 20, 2020. REUTERS/Joe Skipper

NASA astronauts Bob Behnken and Doug Hurley are met by NASA Administrator Jim Bridenstine
 and Kennedy Space Center Director Bob Cabana after they arrived at the Kennedy Space Center to prepare for the launch of SpaceX's Crew Dragon capsule, at Cape Canaveral, Florida, U.S. May 20, 2020. REUTERS/Joe Skipper

NASA astronauts Bob Behnken and Doug Hurley arrive at the Kennedy Space Center to prepare for the launch of SpaceX's Crew Dragon capsule, at Cape Canaveral, Florida, U.S. May 20, 2020. REUTERS/Joe Skipper

NASA astronauts Bob Behnken and Doug Hurley gesture after they arrive at the Kennedy Space Center to prepare for the launch of SpaceX's Crew Dragon capsule, at Cape Canaveral, Florida, U.S. May 20, 2020. REUTERS/Joe Skipper

NASA astronauts Bob Behnken and Doug Hurley arrive at the Kennedy Space Center to prepare for the launch of SpaceX's Crew Dragon capsule, at Cape Canaveral, Florida, U.S. May 20, 2020. REUTERS/Joe Skipper TPX IMAGES OF THE DAY

NASA astronauts Bob Behnken and Doug Hurley arrive at the Kennedy Space Center to prepare for the launch of SpaceX's Crew Dragon capsule, at Cape Canaveral, Florida, U.S. May 20, 2020. REUTERS/Joe Skipper

NASA astronauts Bob Behnken and Doug Hurley arrive at the Kennedy Space Center to prepare for the launch of SpaceX's Crew Dragon capsule, at Cape Canaveral, Florida, U.S. May 20, 2020. REUTERS/Joe Skipper

Workers pressure wash the logo of NASA on the Vehicle Assembly Building before SpaceX will send two NASA astronauts to the International Space Station aboard its Falcon 9 rocket, at the Kennedy Space Center in Cape Canaveral, Florida, U.S., May 19, 2020. REUTERS/Joe Skipper

Workers pressure wash the logo of NASA on the Vehicle Assembly Building before SpaceX will send two NASA astronauts to the International Space Station aboard its Falcon 9 rocket, at the Kennedy Space Center in Cape Canaveral, Florida, U.S., May 19, 2020. REUTERS/Joe Skipper

Workers pressure wash the logo of NASA on the Vehicle Assembly Building before SpaceX will send two NASA astronauts to the International Space Station aboard its Falcon 9 rocket, at the Kennedy Space Center in Cape Canaveral, Florida, U.S., May 19, 2020. REUTERS/Joe Skipper

A Jewish child dressed as an astronaut adjusts his helmet as he celebrates the annual holiday of Purim in Stamford Hill in London, Britain March 10, 2020. REUTERS/Simon Dawson

Feb 2, 2020; Houston, Texas, USA; American astronaut Scott Kelly (left) talks with Houston mayor Sylvester Turner (right) during the game between the Houston Rockets and the New Orleans Pelicans at Toyota Center. Mandatory Credit: Troy Taormina-USA TODAY Sports

Italian ESA astronaut Luca Parmitano addresses a news conference after returning from commanding the International Space Station (ISS) mission at the European Space Agency (ESA) training centre near the Cologne-Bonn international airport in Wahn, Germany, February 8, 2020. REUTERS/Wolfgang Rattay

Italian ESA astronaut Luca Parmitano addresses a news conference after returning from commanding the International Space Station (ISS) mission at the European Space Agency (ESA) training centre near the Cologne-Bonn international airport in Wahn, Germany, February 8, 2020. REUTERS/Wolfgang Rattay

Italian ESA astronaut Luca Parmitano addresses a news conference after returning from commanding the International Space Station (ISS) mission at the European Space Agency (ESA) training centre near the Cologne-Bonn international airport in Wahn, Germany, February 8, 2020. REUTERS/Wolfgang Rattay

Italian ESA astronaut Luca Parmitano arrives for a news conference after returning from commanding the International Space Station (ISS) mission at the European Space Agency (ESA) training centre near the Cologne-Bonn international airport in Wahn, Germany, February 8, 2020. REUTERS/Wolfgang Rattay

Italian ESA astronaut Luca Parmitano addresses a news conference after returning from commanding the International Space Station (ISS) mission at the European Space Agency (ESA) training centre near the Cologne-Bonn international airport in Wahn, Germany, February 8, 2020. REUTERS/Wolfgang Rattay

Italian ESA astronaut Luca Parmitano addresses a news conference after returning from commanding the International Space Station (ISS) mission at the European Space Agency (ESA) training centre near the Cologne-Bonn international airport in Wahn, Germany, February 8, 2020. REUTERS/Wolfgang Rattay

A close up of the overall of Italian ESA astronaut Luca Parmitano is pictured during his news conference after returning from commanding the International Space Station (ISS) mission at the European Space Agency (ESA) training centre near the Cologne-Bonn international airport in Wahn, Germany, February 8, 2020. REUTERS/Wolfgang Rattay

A close up of the overall of Italian ESA astronaut Luca Parmitano is pictured during his news conference after returning from commanding the International Space Station (ISS) mission at the European Space Agency (ESA) training centre near the Cologne-Bonn international airport in Wahn, Germany, February 8, 2020. REUTERS/Wolfgang Rattay

Italian ESA astronaut Luca Parmitano addresses a news conference after returning from commanding the International Space Station (ISS) mission at the European Space Agency (ESA) training centre near the Cologne-Bonn international airport in Wahn, Germany, February 8, 2020. REUTERS/Wolfgang Rattay

Italian ESA astronaut Luca Parmitano addresses a news conference after returning from commanding the International Space Station (ISS) mission at the European Space Agency (ESA) training centre near the Cologne-Bonn international airport in Wahn, Germany, February 8, 2020. REUTERS/Wolfgang Rattay

NASA astronaut Christina Koch arrives at an airport in Karaganda, Kazakhstan February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

NASA astronaut Christina Koch, Russian cosmonaut Alexander Skvortsov of Roscosmos and ESA astronaut Luca Parmitano, dressed in traditional Kazakh national attires, attend a news conference in an airport of Karaganda, Kazakhstan February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

Russian traditional wooden dolls Matryoshka depicting NASA astronaut Christina Koch, Russian cosmonaut Alexander Skvortsov of Roscosmos and ESA astronaut Luca Parmitano are seen during a news conference in an airport of Karaganda, Kazakhstan February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

ESA astronaut Luca Parmitano, dressed in a traditional Kazakh national attire, holds a Russian traditional wooden doll Matryoshka depicting him, during a news conference in an airport of Karaganda, Kazakhstan February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

ESA astronaut Luca Parmitano, dressed in a traditional Kazakh national attire, attends a news conference in an airport of Karaganda, Kazakhstan February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

ESA astronaut Luca Parmitano, dressed in a traditional Kazakh national attire, attends a news conference in an airport of Karaganda, Kazakhstan February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

NASA astronaut Christina Koch, dressed in a traditional Kazakh national attire, holds a Russian traditional wooden doll Matryoshka depicting her, during a news conference in an airport of Karaganda, Kazakhstan February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

NASA astronaut Christina Koch, dressed in a traditional Kazakh national attire, holds a Russian traditional wooden doll Matryoshka depicting her, during a news conference in an airport of Karaganda, Kazakhstan February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

NASA astronaut Christina Koch reacts after landing with the Soyuz MS-13 space capsule in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

A search and rescue team carries ESA astronaut Luca Parmitano after landing with the Soyuz MS-13 space capsule in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

ESA astronaut Luca Parmitano reacts after landing with the Soyuz MS-13 space capsule in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

ESA astronaut Luca Parmitano reacts after landing with the Soyuz MS-13 space capsule in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

A search and rescue team carries ESA astronaut Luca Parmitano after landing with the Soyuz MS-13 space capsule in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

A search and rescue team carries ESA astronaut Luca Parmitano after landing with the Soyuz MS-13 space capsule in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

A search and rescue team carries NASA astronaut Christina Koch after landing with the Soyuz MS-13 space capsule in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

A search and rescue team helps ESA astronaut Luca Parmitano out of the Soyuz MS-13 space capsule carrying him and International Space Station (ISS) crew members Christina Koch and Alexander Skvortsov, after landing in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

A search and rescue team helps NASA astronaut Christina Koch out of the Soyuz MS-13 space capsule carrying her and International Space Station (ISS) crew members Luca Parmitano and Alexander Skvortsov, after landing in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

A search and rescue team helps ESA astronaut Luca Parmitano out of the Soyuz MS-13 space capsule carrying him and International Space Station (ISS) crew members Christina Koch and Alexander Skvortsov, after landing in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

A search and rescue team helps NASA astronaut Christina Koch out of the Soyuz MS-13 space capsule carrying her and International Space Station (ISS) crew members Luca Parmitano and Alexander Skvortsov, after landing in Zhezkazgan, Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

Specialists help ESA (European Space Agency) astronaut Luca Parmitano shortly after landing of the Russian Soyuz MS-13 space capsule in a remote area southeast of Zhezkazgan in the Karaganda region of Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

Specialists help NASA astronaut Christina Koch shortly after landing of the Russian Soyuz MS-13 space capsule in a remote area southeast of Zhezkazgan in the Karaganda region of Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS TPX IMAGES OF THE DAY

Specialists help ESA (European Space Agency) astronaut Luca Parmitano shortly after landing of the Russian Soyuz MS-13 space capsule in a remote area southeast of Zhezkazgan in the Karaganda region of Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

(L-R) NASA astronaut Christina Koch, Roscosmos cosmonaut Alexander Skvortsov and ESA (European Space Agency) astronaut Luca Parmitano are seen shortly after landing of the Russian Soyuz MS-13 space capsule in a remote area southeast of Zhezkazgan in the Karaganda region of Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

NASA astronaut Christina Koch reacts shortly after landing of the Russian Soyuz MS-13 space capsule in a remote area southeast of Zhezkazgan in the Karaganda region of Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

NASA astronaut Christina Koch gets assistance shortly after landing of the Russian Soyuz MS-13 space capsule in a remote area southeast of Zhezkazgan in the Karaganda region of Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

NASA astronaut Christina Koch sits in a chair shortly after landing of the Russian Soyuz MS-13 space capsule in a remote area southeast of Zhezkazgan in the Karaganda region of Kazakhstan, February 6, 2020. Sergei Ilnitsky/Pool via REUTERS

NASA astronaut Bob Behnken speaks at a news conference after SpaceX completed an in-flight abort test at the Kennedy Space Center in Cape Canaveral, Florida, U.S., January 19, 2020. The astronauts are expected to be the first crew on a SpaceX test launch to the International Space Station. REUTERS/Joe Skipper

NASA astronaut Doug Hurley speaks at a news conference after SpaceX completed an in-flight abort test at the Kennedy Space Center in Cape Canaveral, Florida, U.S., January 19, 2020. The astronauts are expected to be the first crew on a SpaceX test launch to the International Space Station. REUTERS/Joe Skipper

NASA astronauts Doug Hurley (R) and Bob Behnken speak at a news conference after SpaceX completed an in-flight abort test at the Kennedy Space Center in Cape Canaveral, Florida, U.S., January 19, 2020. The astronauts are expected to be the first crew on a SpaceX test launch to the International Space Station. REUTERS/Joe Skipper

SpaceX founder and chief engineer Elon Musk attends a post-launch news conference to discuss the SpaceX Crew Dragon astronaut capsule in-flight abort test at the Kennedy Space Center in Cape Canaveral, Florida, U.S. January 19, 2020. REUTERS/Steve Nesius

SpaceX founder and chief engineer Elon Musk attends a post-launch news conference to discuss the SpaceX Crew Dragon astronaut capsule in-flight abort test at the Kennedy Space Center in Cape Canaveral, Florida, U.S. January 19, 2020. REUTERS/Steve Nesius

SpaceX founder and chief engineer Elon Musk attends a post-launch news conference to discuss the SpaceX Crew Dragon astronaut capsule in-flight abort test at the Kennedy Space Center in Cape Canaveral, Florida, U.S. January 19, 2020. REUTERS/Steve Nesius