Engine problem leads NASA to scrub launch of new moon rocket

A fuel leak and then an engine problem during final liftoff preparations led NASA to scrub the launch of its mighty new moon rocket Monday morning on a shakedown flight with three test dummies aboard.

The next launch attempt will not take place until Friday at the earliest.

As precious minutes ticked away, NASA repeatedly stopped and started the fueling of the Space Launch System rocket with nearly 1 million gallons of super-cold hydrogen and oxygen because of a leak of highly explosive hydrogen in the same place that saw seepage during a dress rehearsal back in the spring.

Then, NASA ran into new trouble when it was unable to properly chill one of the rocket’s four main engines, officials said. Engineers continued working to gather data and pinpoint the source of the problem after the launch postponement was announced.

The rocket was set to lift off on a mission to put a crew capsule into orbit around the moon. The launch represents a milestone in America’s quest to put astronauts back on the lunar surface for the first time since the Apollo program ended 50 years ago.

The 322-foot (98-meter) spaceship is the most powerful rocket ever built by NASA, out-muscling even the Saturn V that took the Apollo astronauts to the moon.

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