The Demo-2 mission was called off due to bad weather.
Prospects for an on-time liftoff hinged on the weather, with U.S. Air Force forecasters on Wednesday morning citing a 50% chance that thick clouds over eastern Florida could force a postponement.
The next launch window is scheduled for Saturday at 3:22 pm ET. Saturday, May 30 will be the next launch date. The official launch time, 4:33pm EDT (that's 9:33pm BST for everyone in the UK), is just under an hour from now, and we have the launch live stream video embedded below.
According to CNN, this flight is seen as historic as it would have been the first to take off from United States soil with humans on-board since 2011.
NASA said the flight test will provide data on "the performance of the Falcon 9 rocket, the Crew Dragon and ground systems, as well as in-orbit, docking, and landing operations".
"We envision a future where low Earth orbit is entirely commercialized where NASA is one customer of many customers", said Jim Bridenstine, the agency's administrator.
NASA and SpaceX's Demo-2 mission was scrubbed Wednesday just minutes before lift-off because of unfavorable weather conditions.
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The astronauts were to have blasted off from the same launch pad used in 2011 by NASA's final space shuttle flight, which was piloted by Hurley.
SpaceX and NASA had to postpone their highly anticipated spaceflight as rain continuously poured around the launchpad.
These spacesuits are different from the ones worn on spacewalks outside the space station.
The presence of visiting dignitaries, including President Donald Trump, Vice President Mike Pence and billionaire SpaceX Chief Executive Elon Musk added to the high-pressure mood at the Kennedy Space Centre.
"We're expecting a smooth ride but we're expecting a loud ride", said Behnken, who, like Hurley, also flew in the shuttles twice. "I think our teams worked together in a really impressive way, making good decisions all along".
It looks entirely different to the enormous space shuttles, huge winged vehicles that carried astronauts into space from U.S. soil from 1981 to 2011. "When people put this spacesuit on, he wants them to look better than they did without it, like a tux", Fernandez said.
NASA hired SpaceX and Boeing in 2014 to transport astronauts to the space station, after commercial cargo shipments had taken off. Development of SpaceX's Dragon and Boeing's Starliner capsules took longer than expected, however, and the USA has been paying Russian Federation to launch NASA astronauts in the interim.