The launch of the world's most powerful rocket on its test flight to the moon's orbit has been postponed, after scientists discovered a hydrogen leak on board. The Artemis 1 could now lift off from Cape Canaveral on Friday, after missing its launch window today.

NASA said: "Launch director Charlie Blackwell-Thompson has called a scrub of the attempt of the launch of Artemis 1. "The issue that came up was an engine bleed which couldn't be remedied, but the rocket is currently in a stable configuration.

"It was mostly tanked, but not completely tanked.