That's when the space station will be in the desired place relative to NASA's Kennedy Space Center in Florida, Demo-2's launch site, explained Hans Koenigsmann, SpaceX's vice president of mission assurance. Saturday, May 30 will be the next launch date.
At the time, there were no lightnings anywhere around the launch pad but the rocket basically acted like a giant conductor when it launched through the atmosphere.
SpaceX and NASA "will continue monitoring liftoff and downrange weather as we step into the countdown", Bridenstine added.
When it does launch, the Dragon spacecraft, created to eventually carry private passengers into orbit, the ISS or beyond, is scheduled to dock with the ISS after a 17-hour flight.
After giving thumbs-up signs at the launch pad, the duo made their way up a 265-foot-tall (80-meters) tower to the crew access arm, a bridge that leads to the capsule atop the Falcon 9 rocket.
The NASA astronauts Bob Behnken and Doug Hurley were strapped in their Crew Dragon capsule and the launchpad platform retracted and rocket fueling underway when launch director Mike Taylor announced, "Unfortunately, we are not going to launch today". McAleenan's team supervises all East Coast rocket launches and monitors the weather for NASA and SpaceX.
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"We could see some raindrops on the windows and just figured that whatever it was, was too close to the launch pad at the time we needed it not to be", Hurley, the spacecraft commander, said after the flight was scrubbed.
A successful SpaceX launch will make history as the first time a private company has launched astronauts into orbit.
It would also be the first time in almost a decade that the United States launched astronauts into orbit from USA soil. Veterans astronauts Robert Behnken and Douglas Hurley were due to take off Wednesday afternoon. The first manned mission to launch from American soil since 2011 and the first commercial manned launch was called off due to storm conditions.
NASA had planned to be able to broadcast a phase burn of the Crew Dragon capsule on its live feed webpage at 5:22 p.m., which was to carry NASA astronauts Doug Hurley and Bob Behnken to the International Space Station.
"It was a great day for NASA, it was a great day for SpaceX". "If we are not ready to go, we simply do not go". "We appreciate your resilience sitting there in the vehicle for us", launch controllers told the crew.
Air Force One has just flown low over the space centre, giving Donald Trump a close-up view of the launchpad as he arrived to watch the launch. "When people put this spacesuit on, he wants them to look better than they did without it, like a tux", Fernandez said.