NASA said on Tuesday that it was delaying its mission to send four astronauts on a journey around the moon, after issues arose during a critical test of its rocket.

NASA has delayed the launch of Artemis II, a mission that would send astronauts to the moon for the first time in more than 50 years, after a fuel test uncovered hydrogen leaks.

"During the test, teams worked through a liquid hydrogen leak at a core stage interface during tanking, which required pauses to warm hardware and adjust propellant flow," Isaacman wrote.