NASA's long-awaited return to the Moon with the biggest and most powerful rocket ever built has suffered another setback.
The rocket was due to make a second attempt to blast off on Sunday morning (AEST) but was called off due to a last-minute fuel leak.
The fuel leak was much larger than one initially detected following the rocket's first attempt from the Kennedy Space Center last Monday, which was aborted due to a problem with a sensor in the engine cooling system.
