KENNEDY SPACE CENTER, FLA. -- A small water spout forms east of Launch Complex 39, Kennedy Space Center. The American flag is flying at the Press Site, near the mission countdown clock.

NASA Deputy Administrator Jim Morhard speaks to members of the media during a press briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

Kennedy Space Center Director Bob Cabana participates in a NASA Social YouTube Live briefing May 29, 2020, near the Press Site countdown clock at Kennedy ahead of NASA’s SpaceX Demo-2 launch. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

Joshua Santora, with NASA Communications, participates in a NASA Social YouTube Live briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

CAPE CANAVERAL, Fla. – Spotlights bounce off the clouds over Space Launch Complex 41 on Cape Canaveral Air Force Station as NASA's Radiation Belt Storm Probes, or RBSP, lift off the pad at 4:05 a.m. EDT aboard a United Launch Alliance Atlas V rocket. In the foreground, at left, is the countdown clock at the Press Site at NASA's Kennedy Space Center. RBSP will explore changes in Earth's space environment caused by the sun -- known as "space weather" -- that can disable satellites, create power-grid failures and disrupt GPS service. The mission also will provide data on the fundamental radiation and particle acceleration processes throughout the universe. For more information on RBSP, visit http://www.nasa.gov/rbsp. Photo credit: NASA/David Lee

NASA astronaut Nicole Mann participates in a NASA Social YouTube Live briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

NASA Administrator Jim Bridenstine participates in a NASA Social YouTube Live briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

NASA astronaut Kjell Lindgren speaks to members of the media during a press briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. Behind him is NASA astronaut Nicole Mann. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

NASA Administrator Jim Bridenstine speaks to members of the media during a press briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. Behind him are Kennedy Space Center Director Bob Cabana (far left), NASA astronauts Kjell Lindgren and Nicole Mann, and NASA Deputy Administrator Jim Morhard (far right). The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

NASA astronaut Nicole Mann speaks to members of the media during a press briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. Behind her is NASA astronaut Kjell Lindgren. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

NASA Administrator Jim Bridenstine speaks to members of the media during a press briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. Behind him are Kennedy Space Center Director Bob Cabana (far left), NASA astronauts Kjell Lindgren and Nicole Mann, and NASA Deputy Administrator Jim Morhard (far right). The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

NASA Administrator Jim Bridenstine speaks to members of the media during a press briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. Behind him is NASA astronaut Kjell Lindgren. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

Kennedy Space Center Director Bob Cabana speaks to members of the media during a press briefing May 29, 2020, near the Press Site countdown clock at Kennedy ahead of NASA’s SpaceX Demo-2 launch. Behind him is NASA astronaut Kjell Lindgren. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from historic Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

NASA Administrator Jim Bridenstine (far left) participates in a NASA Social YouTube Live briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. Standing next to him are NASA astronauts Nicole Mann (left) and Kjell Lindgren, Kennedy Space Center Director Bob Cabana and NASA Communications’ Joshua Santora (far right). The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

Joshua Santora, far right, with NASA Communications, moderates a NASA Social YouTube Live briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. From left, participants include NASA Administrator Jim Bridenstine, NASA astronauts Nicole Mann and Kjell Lindgren, and Kennedy Space Center Director Bob Cabana. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.

From left, NASA Administrator Jim Bridenstine and NASA astronauts Nicole Mann and Kjell Lindgren participate in a NASA Social YouTube Live briefing May 29, 2020, near the Press Site countdown clock at the agency’s Kennedy Space Center in Florida ahead of NASA’s SpaceX Demo-2 launch. The launch, initially scheduled for May 27, was scrubbed due to unfavorable weather conditions. The next launch attempt is Saturday, May 30. A SpaceX Falcon 9 rocket and Crew Dragon spacecraft are scheduled to lift off from Kennedy’s Launch Complex 39A, carrying NASA astronauts Robert Behnken and Douglas Hurley to the International Space Station. This will mark the first launch of astronauts from U.S. soil to the space station since the conclusion of the Space Shuttle Program in 2011. Part of the agency’s Commercial Crew Program, this will be SpaceX’s final flight test, paving the way for NASA to certify the crew transportation system for regular, crewed flights to the orbiting laboratory. Liftoff is scheduled for 3:22 p.m. EDT.