A fuel leak prevents NASA from launching its second moon rocket attempt.

As the launch team started fueling NASA's new moon rocket for liftoff on a test trip that must go smoothly 

before people step onboard, the rocket sprung another potentially dangerous leak on Saturday.

The 322-foot (98-meter) rocket, the most potent ever created by NASA, is being filled with roughly 1 million gallons of fuel for the second time this week.

The attempt on Monday was unsuccessful due to a faulty engine sensor and fuel leak.The tanking procedure was momentarily stopped

when the sun rose due to an over-pressure alert, but no damage was done and it was resumed.

However, a few minutes later, hydrogen fuel started to flow from the rocket's engine component near the bottom.

Before astronauts board the subsequent voyage, NASA aims to complete a full orbit of the moon in the crew capsule atop the rocket. Astronauts could fly around the moon in 2024 

and arrive there in 2025 if the five-week test demonstration using test dummies is successful. 50 years have passed since the last lunar landing.

The $4.1 billion test mission is the first phase of NASA's Artemis programme for resumed lunar exploration, which is named for Apollo's twin sister from Greek mythology.

Artemis seeks to establish a long-term human presence on the moon, with crews eventually staying there for weeks at a time.

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