It started with a flash of insight like a thunderbolt in a snow storm, the sort of insight that can only be induced by high altitude hypoxia and making breakfast.
Technicians are trying to diagnose a helium flow problem in the upper stage of the moon rocket ahead of Artemis II, which could launch as early as April.
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Nasa said the mission could take its astronauts further into space than anyone has been before.
Driver size: 11mm