Former senator Bill Nelson points to the Lunar sample from Apollo 16 collected by astronaut John Young, accompanied by his wife Grace, his son Bill Jr., and his daughter Nan Ellen, after being sworn in by Vice President Kamala Harris as NASA's 14th administrator, with guests Pam Melroy, nominee for Deputy NASA Administrator, and Charlie Bolden, former NASA Administrator, holding a laptop with former administrator Jim Bridenstine on the screen, in the Eisenhower Executive Office Building at the White House in Washington, U.S., May 3, 2021. REUTERS/Cheriss May

Visitors pose for pictures near a billboard with an image of China's spacecraft and astronaut at an exhibition on the country's Space Day at China Science and Technology Museum in Beijing, China April 24, 2021. REUTERS/Tingshu Wang

Visitors look at space suits worn by Chinese astronauts from manned space program, at an exhibition featuring the development of China's space exploration on the country's Space Day at China Science and Technology Museum in Beijing, China April 24, 2021. REUTERS/Tingshu Wang

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Steve Nesius

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Steve Nesius

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

The sky glows as a SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Steve Nesius

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur TPX IMAGES OF THE DAY

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Steve Nesius

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Steve Nesius

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur REFILE - CORRECTING DATE

A SpaceX Falcon 9 rocket, with the Crew Dragon capsule, is launched carrying four astronauts on a NASA commercial crew mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur REFILE - CORRECTING DATE

JAXA astronaut Akihiko Hoshide reacts as he arrives for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

NASA astronauts Shane Kimbrough and Megan McArthur, JAXA astronaut Akihiko Hoshide and ESA astronaut Thomas Pesquet arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

ESA astronaut Thomas Pesquet, NASA astronauts Shane Kimbrough and Megan McArthur, and JAXA astronaut Akihiko Hoshide arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A Tesla carrying the SpaceX Crew Dragon 2 astronauts passes the VAB on its way to Pad 39A for a mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Thom Baur

NASA astronaut Megan McArthur gives her son, Theodore Behnken and husband, Bob Behnken who is also an astronaut, a virtual hug as she arrives for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

A Tesla carrying the SpaceX Crew Dragon 2 astronauts passes the VAB on its way to Pad 39A for a mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Steve Nesius

A Tesla carrying the SpaceX Crew Dragon 2 astronauts passes the VAB on its way to Pad 39A for a mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Steve Nesius

A Tesla carrying the SpaceX Crew Dragon 2 astronauts passes the VAB on its way to Pad 39A for a mission to the International Space Station at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Steve Nesius

NASA astronauts Shane Kimbrough and Megan McArthur, JAXA astronaut Akihiko Hoshide and ESA astronaut Thomas Pesquet arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

ESA astronaut Thomas Pesquet, NASA astronauts Shane Kimbrough and Megan McArthur, and JAXA astronaut Akihiko Hoshide arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

NASA astronauts Shane Kimbrough and Megan McArthur, JAXA astronaut Akihiko Hoshide and ESA astronaut Thomas Pesquet arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

NASA astronauts Shane Kimbrough and Megan McArthur, JAXA astronaut Akihiko Hoshide and ESA astronaut Thomas Pesquet arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper TPX IMAGES OF THE DAY

ESA astronaut Thomas Pesquet arrives for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

NASA astronauts Shane Kimbrough and Megan McArthur arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

ESA astronaut Thomas Pesquet arrives for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

ESA astronaut Thomas Pesquet and JAXA astronaut Akihiko Hoshide arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

NASA astronauts Shane Kimbrough and Megan McArthur, JAXA astronaut Akihiko Hoshide and ESA astronaut Thomas Pesquet arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

ESA astronaut Thomas Pesquet, NASA astronauts Shane Kimbrough and Megan McArthur, and JAXA astronaut Akihiko Hoshide arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

JAXA astronaut Akihiko Hoshide arrives for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

NASA astronauts Shane Kimbrough and Megan McArthur arrive for the boarding of the SpaceX Falcon 9 rocket with the Crew Dragon capsule, before the launch of the NASA commercial crew mission at Kennedy Space Center in Cape Canaveral, Florida, U.S., April 23, 2021. REUTERS/Joe Skipper

The SpaceX Falcon 9 rocket stands at Pad 39-A with the Crew-2 astronauts displayed on a video screen at the Kennedy Space Center press site after a prelaunch news conference in Cape Canaveral, Florida, U.S., April 21, 2021. REUTERS/Steve Nesius

The SpaceX Falcon 9 rocket stands at Pad 39-A as the Crew-2 astronauts are displayed on a video screen at the Kennedy Space Center press site before a prelaunch news conference in Cape Canaveral, Florida, U.S. April 21, 2021. The launch has been delayed for 24 hours due to down-range weather concerns. REUTERS/Steve Nesius

The SpaceX Falcon 9 rocket stands at Pad 39-A with the Crew-2 astronauts displayed on a video screen at the Kennedy Space Center press site before a prelaunch news conference in Cape Canaveral, Florida, U.S. April 21, 2021. REUTERS/Steve Nesius

JAXA astronaut Akihiko Hoshide speaks as astronauts arrive at The Kennedy Space Center ahead of the NASA/SpaceX launch of a commercial crew mission to the International Space Station, in Cape Canaveral, Florida, U.S., April 16, 2021. REUTERS/Joe Skipper

ESA astronaut Thomas Pesquet, NASA astronaut Megan McArthur and JAXA astronaut Akihiko Hoshide arrive at The Kennedy Space Center ahead of the NASA/SpaceX launch of a commercial crew mission to the International Space Station, in Cape Canaveral, Florida, U.S., April 16, 2021. REUTERS/Joe Skipper

NASA astronaut Shane Kimbrough and JAXA astronaut Akihiko Hoshide arrive at The Kennedy Space Center ahead of the NASA/SpaceX launch of a commercial crew mission to the International Space Station, in Cape Canaveral, Florida, U.S., April 16, 2021. REUTERS/Joe Skipper