(NEW YORK) — NASA kicked off Monday its plan to send an unmanned space capsule into the moon’s orbit, marking the initial launch in an ambitious plan to establish a long term presence on the moon for scientific discovery and economic development.

The space capsule, called Artemis 1, will travel for roughly 40 days — reaching as close as 60 miles from the moon, and then 40,000 miles above the moon when orbiting over its dark side — before landing in the Pacific Ocean off the coast of San Diego.

After the launch was scrubbed, the next attempt will occur Sept. 2.

Here’s how the news is developing:

Aug 29, 9:40 AM EDT ‘We don’t launch until it’s right,’ says NASA administrator

NASA Administrator Bill Nelson defended the scrubbing of the Artemis I launch, saying the launch shouldn’t take place until the team is sure it’s ready.

“We don’t launch until it’s right,” he said during an interview on NASA TV Monday morning.

“There are certain guidelines. And I think it’s just illustrative that this is a very complicated machine, a very complicated system, and all those things have to work, and you don’t want to light the candle until it’s ready to go,” he said.

Nelson said the engineers will continue to “stress” and “test” the rocket to make sure it’s ready by the next attempt, which is Sept. 2.

Earlier in the day, Nelson had welcomed several Biden administration officials, including Vice President Kamala Harris and second gentleman Doug Emhoff, to the Kennedy Space Center ahead of the launch.

He said the vice president has been briefed and the White House will continue to receive regular updates.

Aug 29, 8:48 AM EDT NASA scrubs Artemis I launch

NASA announced a few minutes after Artemis I was initially scheduled to lift off that the launch has been scrubbed.

Engineers said the problem came from a liquid hydrogen line that was not chilled enough inside one of the rocket’s four core-stage engines, which needs to occur before they can be ignited.

The next attempt will occur on Sept. 2.

Aug 29, 8:31 AM EDT Artemis launch delayed due to storms, rocket troubleshooting

Artemis I will likely not be launching at 8:33 a.m. ET as originally planned after NASA ran into several delays in its preparation to send it into space.

The process of tanking, which includes filling the rocket’s core stage with liquid oxygen and liquid hydrogen, was delayed due to some passing storms and lightning in the area, NASA said.

Moreover, a leak was discovered in the hydrogen fuel line, which NASA quickly resolved. The leak concentration was “at an acceptable level,” NASA said.

Engineers also discovered a potential crack in the inner stage flange, which connects two of the rocket’s cylinders.

The countdown clock is currently paused at T-40 and the launch can go as late as 10:33 a.m. ET If that window passes, the next attempt at launch will be Sept. 2.

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