The US space agency has had to postpone the launch of its new Artemis I Moon rocket for the second time in a week, APA reports citing BBC.
Controllers were unable to stop a hydrogen leak on the vehicle, almost from the start of Saturday's countdown procedure.
Nasa now has another opportunity to launch the rocket on Monday or Tuesday.
After that the vehicle will have to return to its assembly building for inspection and maintenance, which will mean further delays.
The Space Launch System is the most powerful rocket ever developed by Nasa, and is designed to send astronauts and their equipment back to the lunar surface after an absence of 50 years.
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