AFTER scrapping a second attempt to get its new 30-storey rocket off the ground due to a fuel leak, Nasa announced yesterday it will not try again during its current window of opportunity, which ends early next week.

Determined by the position of the Earth and Moon, the current launch period for Nasa’s Artemis 1 mission ends on Tuesday and is “definitely off the table,” Jim Free, associate administrator for Exploration Systems Development, said at a press conference yesterday, without confirming a new date.

The next possible launch windows according to Nasa are September 19 to October 4 and then October 17 to 31.

Millions around the globe and crowds gathered on beaches in Florida had hoped to witness the historic blast-off of the space launch system (SLS), but a leak near the base of the rocket was found as ultra-cold liquid hydrogen was 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.”

The latest postponement “was the right decision after you develop this kind of leak,” astronaut Victor Glover told reporters.

“These (are) really incredibly complex machines. When you see a scrub, people should gain confidence, not lose confidence.”

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.

Next month?

The rocket will likely have to be hauled back into its assembly building to undergo certification tests that are carried out periodically.

Soon after yesterday’s launch was scrubbed, Nasa Administrator Bill Nelson said that a next attempt may have to be put off until mid-October because early next month a crew will use the Kennedy Space Center to travel to the International Space Station.

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

About 3 million litres of ultra-cold liquid hydrogen and oxygen were due to be pumped into the spacecraft, but the process soon hit problems, with Artemis mission manager Mike Sarafin later describing the issue as “not a manageable leak.”

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.

Apollo’s twin sister

Once launched, it will take several days for the spacecraft to reach the Moon, flying around 100km at its closest approach.

The capsule will fire its engines to get to a distant retrograde orbit (DRO) of 64,000km 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 4.88m in diameter is the largest ever built.

On its return to the Earth’s atmosphere, the heat shield will have to withstand a speed of 40,000km/h and a temperature of 2,760C. That is half as hot as the Sun.

Taking the place of people for now, dummies fitted with sensors will take the place of crew members, recording acceleration, vibration and radiation levels.

It will deploy small satellites to study the lunar surface.

A complete failure would be devastating for a programme that is costing US$4.1 billion (RM18.3 billion) per launch and is already running years behind schedule.

A government audit estimates the Artemis programme’s cost will grow to US$93 billion by 2025.

The next mission, Artemis 2, will take astronauts to the Moon without landing on its surface.

The crew of Artemis 3 is to land on the Moon in 2025 at the earliest, with later missions envisaging a lunar space station and a sustainable presence on the lunar surface.

A crewed trip to the red planet aboard Orion, which would last several years, could be attempted by the end of the 2030s. – AFP, September 4, 2022.