A Falcon 9 SpaceX rocket, ready for launch, sits on pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, March 1, 2019. The Crew Dragon spacecraft unmanned test flight is scheduled for launch early Saturday morning. (AP Photo/Terry Renna)
By: Terry Renna
A Falcon 9 SpaceX rocket, ready for launch, sits on pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, March 1, 2019. The Crew Dragon spacecraft unmanned test flight is scheduled for launch early Saturday morning. (AP Photo/Terry Renna)
By: Terry Renna
A Falcon 9 SpaceX rocket, ready for launch, sits on pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, March 1, 2019. The Crew Dragon spacecraft unmanned test flight is scheduled for launch early Saturday morning. (AP Photo/John Raoux)
By: John Raoux
In this image released by NASA, a Falcon 9 SpaceX rocket, ready for launch, sits on pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, March 1, 2019. The spacecraft's unmanned test flight with the Dragon capsule is scheduled for launch early Saturday morning. (Joel Kowsky/NASA via AP)
By: Joel Kowsky
NASA astronauts Doug Hurley, left, and Bob Behnken attend a news conference before the Falcon 9 SpaceX Crew Demo-1 rocket launch at the Kennedy Space Center in Cape Canaveral, Fla., Friday, March 1, 2019. The astronauts are assigned to fly in the SpaceX Demo-2 flight test later this year. (AP Photo/John Raoux)
By: John Raoux
NASA astronauts Doug Hurley, left, and Bob Behnken attend a news conference before the Falcon 9 SpaceX Crew Demo-1 rocket launch at the Kennedy Space Center in Cape Canaveral, Fla., Friday, March 1, 2019. The astronauts are assigned to fly in the SpaceX Demo-2 flight test later this year. (AP Photo/Terry Renna)
By: Terry Renna
NASA astronauts Doug Hurley, left, and Bob Behnken answer questions during a news conference before the Falcon 9 SpaceX Crew Demo-1 rocket launch at the Kennedy Space Center in Cape Canaveral, Fla., Friday, March 1, 2019. The astronauts are assigned to fly in the SpaceX Demo-2 flight test later this year. (AP Photo/John Raoux)
By: John Raoux
NASA Administrator Jim Bridenstine, left, speaks at a news conference with astronauts, from second left, Doug Hurley, Bob Behnken, Mike Hopkins and Victor Glover before Saturday's Falcon 9 SpaceX Crew Demo-1 rocket launch at the Kennedy Space Center in Cape Canaveral, Fla., Friday, March 1, 2019. (AP Photo/John Raoux)
By: John Raoux
A SpaceX Falcon 9 rocket with the Demo 1 crew capsule lifts off from pad 39A, Saturday, March 2, 2019, in Cape Canaveral, Fla. (AP Photo/Terry Renna)
By: Terry Renna
A SpaceX Falcon 9 rocket with the Demo 1 crew capsule lifts off from pad 39A, Saturday, March 2, 2019, in Cape Canaveral, Fla. (AP Photo/Terry Renna)
By: Terry Renna
A SpaceX Falcon 9 rocket with a demo Crew Dragon spacecraft on an uncrewed test flight to the International Space Station lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)
By: John Raoux
A SpaceX Falcon 9 rocket with a demo Crew Dragon spacecraft on an uncrewed test flight to the International Space Station lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/Terry Renna)
By: Terry Renna
A SpaceX Falcon 9 rocket with a demo Crew Dragon spacecraft on an uncrewed test flight to the International Space Station lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)
By: John Raoux
The SpaceX Falcon 9 rocket and Crew Dragon capsule launch from NASA pad 39A as seen in a time exposure from Viera, FL. on March 2 with a lone, untrimmed palm tree in the foreground. (Tim Shortt/Florida Today via AP)
By: Tim Short
A SpaceX Falcon 9 rocket with a demo Crew Dragon spacecraft on an uncrewed test flight to the International Space Station lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)
By: John Raoux
A SpaceX Falcon 9 rocket with a demo Crew Dragon spacecraft on an uncrewed test flight to the International Space Station lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)
By: John Raoux
A SpaceX Falcon 9 rocket with a demo Crew Dragon spacecraft on an uncrewed test flight to the International Space Station lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)
By: John Raoux
The launch of the SpaceX Crew Dragon capsule atop a Falcon 9 rocket to the International Space Station from Pad 39A at Kennedy Space Center Saturday morning, March 2, 2019, in Florida. (Malcolm Denemark/Florida Today via AP)
By: md
NASA astronaut Eric Boe, assistant to the chief of the astronaut office for commercial crew, left, and Norm Knight, deputy director of flight operations at NASA's Johnson Space Center watch the launch of a SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft on the Demo-1 mission from firing room four of the Launch Control Center, Saturday, March 2, 2019 at the Kennedy Space Center in Florida. America's newest capsule for astronauts rocketed Saturday toward the International Space Station on a high-stakes test flight by SpaceX. (NASA/Joel Kowsky)
By: Joel Kowsky
Elon Musk, CEO of SpaceX, speaks during a news conference after the SpaceX Falcon 9 Demo-1 launch at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)
By: John Raoux
Elon Musk, CEO of SpaceX, speaks during a news conference after the SpaceX Falcon 9 Demo-1 launch at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)
By: John Raoux
Elon Musk, CEO of SpaceX, speaks during a news conference after the SpaceX Falcon 9 Demo-1 launch at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)
By: John Raoux
NASA Administrator Jim Bridenstine, left, and Elon Musk, CEO of SpaceX, answer questions during a news conference after the SpaceX Falcon 9 Demo-1 launch at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)
By: John Raoux
Elon Musk, CEO of SpaceX, speaks during a news conference after the SpaceX Falcon 9 Demo-1 launch at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)
By: John Raoux
Elon Musk, left, CEO of SpaceX, speaks as NASA astronauts Bob Behnken, center, and Doug Hurley, right, listen during a news conference after the SpaceX Falcon 9 Demo-1 launch at the Kennedy Space Center in Cape Canaveral, Fla., Saturday, March 2, 2019. (AP Photo/John Raoux)