A SpaceX Falcon 9 lifts off in this time exposure from Launch Complex 39A Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. Four astronauts will fly on the SpaceX Crew-2 mission to the International Space Station. (AP Photo/Chris O'Meara)

A SpaceX Falcon 9 rocket with the Crew Dragon space capsule lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, April 23, 2021. (AP Photo/Brynn Anderson)

NASA astronaut Megan McArthur, right, and NASA astronaut Shane Kimbrough greet family members after leaving the operations and checkout building before a launch attempt Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. Four astronauts will fly on the SpaceX Crew mission to the International Space Station scheduled for launch on April 23, 2021. (AP Photo/John Raoux)

A SpaceX Falcon 9 rocket with the Crew Dragon space capsule lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, April 23, 2021. (AP Photo/John Raoux)

European Space Agency astronaut Thomas Pesquet, of France, left, and Japan Aerospace Exploration Agency astronaut Akihiko Hoshide wave as they leave the operations and checkout building before a launch attempt Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. Four astronauts will fly on the SpaceX Crew mission to the International Space Station scheduled for launch on April 23, 2021. (AP Photo/John Raoux)

European Space Agency astronaut Thomas Pesquet of France, adjusts his glove as he talks to family and friends before a launch attempt Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. Four astronauts will fly on the SpaceX Crew mission to the International Space Station scheduled for launch on April 23, 2021. (AP Photo/John Raoux)

NASA astronaut Megan McArthur waves to family and friends after leaving the operations and checkout building before a launch attempt Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. Four astronauts will fly on the SpaceX Crew mission to the International Space Station scheduled for launch on April 23, 2021. (AP Photo/John Raoux)

The Crew Dragon space capsule astronauts, from front left; NASA astronaut Megan McArthur, NASA astronaut Shane Kimbrough and back row European Space Agency astronaut Thomas Pesquet and Japan Aerospace Exploration Agency astronaut Akihiko Hoshide leave the Operation and Checkout Building on their way to board the capsule for a mission to the International Space Station at the Kennedy Space Center in Cape Canaveral, Fla., Friday, April 23, 2021. (AP Photo/John Raoux)

In this image made from NASA video, astronauts are seen in the cockpit of the SpaceX Crew Dragon spacecraft after lift off for the Crew-2 mission from Launch Complex 39A, Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. (NASA via AP)

NASA astronaut Shane Kimbrough waves as he leaves the operations and checkout building before a launch attempt Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. Four astronauts will fly on the SpaceX Crew mission to the International Space Station scheduled for launch on April 23, 2021. (AP Photo/John Raoux)

A SpaceX Falcon 9 rocket with the Crew Dragon space capsule lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, April 23, 2021. (AP Photo/John Raoux)

In this long exposure photo, photographers watch a SpaceX Falcon 9 rocket with the Crew Dragon space capsule lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, April 23, 2021. (AP Photo/Brynn Anderson)

Photographers watch SpaceX Falcon 9 rocket with the Crew Dragon space capsule lift off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, April 23, 2021. (AP Photo/Brynn Anderson)

A SpaceX Falcon 9 rocket with the Crew Dragon space capsule leaves a trail of smoke as it lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, April 23, 2021. (AP Photo/John Raoux)

NASA acting administrator Steve Jurczyk, left and SpaceX founder and CEO Elon Musk arrive for the walkout of the SpaceX crew before a launch attempt Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. Four astronauts will fly on the SpaceX Crew mission to the International Space Station scheduled for launch on April 23, 2021. (AP Photo/John Raoux)

The Crew Dragon space capsule astronauts, from front left, European Space Agency astronaut Thomas Pesquet, NASA astronaut Megan McArthur, NASA astronaut Shane Kimbrough and Japan Aerospace Exploration Agency astronaut Akihiko Hoshide leave the Operation and Checkout Building on their way to board the capsule for a mission to the International Space Station at the Kennedy Space Center in Cape Canaveral, Fla., Friday, April 23, 2021. (AP Photo/John Raoux)

Japan Aerospace Exploration Agency astronaut Akihiko Hoshide smiles as he talks to family and friends after leaving the operations and checkout building before a launch attempt Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. Four astronauts will fly on the SpaceX Crew mission to the International Space Station scheduled for launch on April 23, 2021. (AP Photo/John Raoux)

In this image made from NASA video, the SpaceX Crew Dragon spacecraft lifts off for the Crew-2 mission carrying NASA astronauts Shane Kimbrough, Megan McArthur, ESA (European Space Agency) astronaut Thomas Pesquet, and Japan Aerospace Exploration Agency (JAXA) astronaut Akihiko Hoshide from Launch Complex 39A, Friday, April 23, 2021, at the Kennedy Space Center in Cape Canaveral, Fla. (NASA via AP)

A SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft is launched on NASA's SpaceX Crew-2 mission to the International Space Station with NASA astronauts Shane Kimbrough and Megan McArthur, ESA (European Space Agency) astronaut Thomas Pesquet, and Japan Aerospace Exploration Agency (JAXA) astronaut Akihiko Hoshide onboard, Friday, April 23, 2021, at NASA's Kennedy Space Center in Florida. (Aubrey Gemignani/NASA via AP)

A SpaceX rocket with the company's Dragon capsule is illuminated by spotlights on the launch pad, early Friday, April 23, 2021, at NASA's Kennedy Space Center in Cape Canaveral, Fla. SpaceX aimed to launch its third crew a little before sunrise Friday, this time using a recycled capsule and rocket. The four astronauts, representing the U.S., Japan and France, were supposed to fly to the International Space Station on Thursday. But liftoff was delayed because of poor weather offshore. (Joel Kowsky/NASA via AP)