NASA plans an on-pad repair of the fuel leak that derailed an overnight dress rehearsal countdown for the agency's huge Artemis II rocket.

NASA ran into exasperating fuel leaks during a make-or-break test of its new moon rocket Monday, calling into question how soon astronauts could take off for a trip around the moon .

The delay stems from a wave of Arctic air that has brought extreme cold to the U.S. in recent weeks.