A liquid hydrogen leak has interrupted Nasa’s preparations for its new Moon rocket launch.Controllers halted the fuelling operation for Artemis 1 on Monday morning, but Nasa said its engineers were rectifying the issue and there was no word on whether it would cause delays to take-off from the Kennedy Space Centre in Cape Canaveral, Florida.Nasa said: “Teams continue to troubleshoot a liquid hydrogen leak at the mating interface with the core stage.“After manually chilling down the liquid hydrogen as part of troubleshooting efforts, they are in fast fill operations.”