NASA calls off second launch retry for Artemis moon rocket

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CAPE CANAVERAL, Florida., Sept 3 — For the second time in five days, NASA on Saturday halted a countdown in progress and postponed a planned attempt to launch the debut test flight of its giant, next-generation rocket, the first mission of the agency’s moon-to-Mars Artemis program.The latest attempt to launch the 32-story-tall Space Launch System (SLS) rocket and its Orion capsule was scrubbed after repeated attempts by technicians to correct a leak of super-cooled liquid hydrogen propellant being pumped into the vehicle’s core-stage fuel tanks.Besides struggling to remedy the leak itself, the difficulty caused mission managers to fall behind in the countdown, leaving too little time to complete pre-launch preparations before liftoff.Pre-flight operations were called off for the day about three hours before the targeted two-hour launch window was due to open at 2:17 p.m. EDT (…