Nasa: Artemis Moon rocket second launch attempt called off

The US space agency has had to postpone the launch of its new Artemis I Moon rocket for the second time in a week.

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 much of the enormous thrust comes from burning almost three million litres of super-cold liquid hydrogen and oxygen in four big engines on the vehicle’s underside.

But when controllers sent the early morning command to fill the rocket’s hydrogen tank, an alarm went off, indicating there was a leak.

The problem was traced to the connection where the hydrogen was being pumped into the vehicle.

Controllers tried a number of fixes, including allowing the hardware to…

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