Poor weather has forced SpaceX to call off the launch of Nasa astronauts Doug Hurley and Bob Behnken to the International Space Station (ISS).
The two men were due to go up from the Kennedy Space Center in what would have been the first orbital mission from the US in nine years.
But unfavourable atmospheric conditions prompted controllers to call a stop just 16 minutes before lift-off.
The next opportunity for SpaceX and Nasa will come on Saturday.
If that’s no good, there would be a third opportunity on Sunday.
President Donald Trump, First Lady Melania Trump, and VP Mike Pence and his wife had all flown in to watch the historic launch.