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KENNEDY SPACE CENTER: NASA on Saturday scrapped a second attempt to get its new 30-story rocket off the ground and send its uncrewed test capsule toward the Moon after engineers detected a fuel leak.

With millions around the globe and hundreds of thousands on nearby beaches waiting for the historic launch of the massive Space Launch System (SLS), a leak near the base of the rocket was found as ultra-cold liquid hydrogen was being pumped in.

“The launch director waived off today’s Artemis I launch,” NASA said in a statement. “Multiple troubleshooting efforts to address the area of the leak... did not fix the issue.”

Though the area around the launch site was closed to the public, an estimated 400,000 people had gathered nearby to see — and hear — the most powerful vehicle that NASA has ever launched climb into space.

The initial launch attempt on Monday was also halted after engineers detected a fuel leak and a sensor showed that one of the rocket’s four main engines was too hot.

Early Saturday, launch director Charlie Blackwell-Thompson had given the go-ahead to start filling the rocket’s tanks with cryogenic fuel.

About three million liters of ultra-cold liquid hydrogen and oxygen were due to be pumped into the spacecraft, but the process soon hit problems.

No new date for another try was immediately announced.

After the latest delay, there are backup opportunities on Monday or Tuesday. After that, the next launch window will not be until September 19, due to the Moon’s position.

The purpose of the Artemis 1 mission is to verify that the Orion capsule, which sits atop the SLS rocket, is safe to carry astronauts in the future.

Mannequins equipped with sensors are standing in for astronauts on the mission and will record acceleration, vibration and radiation levels.

It will take several days for the spacecraft to reach the Moon, flying around 60 miles (100 kilometers) at its closest approach. The capsule will fire its engines to get to a distant retrograde orbit (DRO) of 40,000 miles beyond the Moon, a record for a spacecraft rated to carry humans.

The trip is expected to last around six weeks and one of its main objectives is to test the capsule’s heat shield, which at 16 feet in diameter is the largest ever built.

On its return to Earth’s atmosphere, the heat shield will have to withstand speeds of 25,000 miles per hour and a temperature of 5,000 degrees Fahrenheit (2,760 degrees Celsius) — roughly half as hot as the Sun.

Artemis is named after the twin sister of the Greek god Apollo, after whom the first Moon missions were named.

Unlike the Apollo missions, which sent only white men to the Moon between 1969 and 1972, Artemis missions will see the first person of color and the first woman step foot on the lunar surface.

A government audit estimates the Artemis program’s cost will grow to $93 billion by 2025, with each of its first four missions clocking in at a whopping $4.1 billion per launch.

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