NASA scrubbed a planned launch of its powerful rocket, a setback for the agency as it looks to reignite its lunar ambitions.
NASA on Monday had planned to launch the uncrewed Artemis I mission, the U.S. space agency’s first step in its push to put astronauts on the moon for the first time since 1972. The test mission—along with a series of planned follow-up flights in the years ahead—largely hinges on NASA’s Space Launch System, a 322-foot-tall rocket, and the Orion spacecraft, which will carry crew members on future lunar missions.
Liftoff had been expected later than the initially planned 8:33 a.m. ET start time from Launch Pad 39B at the Kennedy Space Center in Florida, because of delays fueling up the rocket. NASA later canceled the mission, citing a problem with one of the engines installed on the SLS rocket. The next potential launch window is on Sept. 2.
Kennedy Space Center, Florida (CNN)The launch of NASA's historic Artemis I moon mission has been postponed after the team was unable to work through an issue with one of the rocket's four engines.
"It's too early to say what the options are," said Mike Sarafin, Artemis mission manager at a NASA press conference. "We really need time to look at all the information, all the data. We're going to play all nine innings here. We're not ready to give up yet."
The next opportunity to send the Space Launch System rocket and Orion spacecraft on their journey is September 2, but whether or not another attempt is made that day depends on how testing goes.
Sarafin confirmed that "Friday is definitely in play" if the team can resolve the issue while the rocket sits on the pad within the next 48 to 72 hours.
The next launch window is September 2, opening at 12:48 p.m. ET and closing at 2:48 p.m. ET. The next window after that is September 5, opening at 5:12 p.m. ET and closing at 6:42 p.m. ET.
"Launch controllers were continuing to evaluate why a bleed test to get the RS-25 engines on the bottom of the core stage to the proper temperature range for liftoff was not successful, and ran out of time in the two-hour launch window," according to an update from NASA. "Engineers are continuing to gather additional data."
The launch team knew that the bleed test was a risk because they weren't able to include it in previous wet dress rehearsal tests simulating the launch, and Monday was the first time demonstrating that, Sarafin said.
Currently, the issue doesn't suggest an engine problem, but rather an issue within the bleed system that is used to cool the engine, he said.
"We need the engine to be at the cryogenically cool temperature such that when it starts, it's not shocked with all the cold fuel that flows through it. So we needed a little extra time to assess that," Sarafin said.
The team also saw an issue with the vent valve at the inner tank and the combination of issues convinced the team they needed more time, Sarafin said.
If a substantial fix is needed the team may require more time to address it and roll the rocket stack back into the Kennedy Space Center's Vehicle Assembly Building, a process that takes 3 1/2 days.
The launch team still needs to troubleshoot the engine issue and will keep the rocket in its current configuration to gather data and assess what needs to be done. Both the Space Launch System rocket and Orion spacecraft remain stable, according to NASA officials.
Prior to the scrub, the countdown was extended into an unplanned hold as the launch team worked on a troubleshooting plan for one of the rocket's four engines.
That's because the launch team discovered an issue with an engine bleed in engine #3. Attempts to reconfigure it were unsuccessful.
During engine bleeds, hydrogen is cycled through the engine to condition it for launch. Three of the four engines are performing as expected, but engine #3 experienced an issue.
"There were also a series of weather issues throughout the launch window. We would have been a no-go for weather at the beginning of the window due to precipitation. Later on in the window, we would have been no-go for lightning within the launchpad area," Sarafin said.
Previously, 80% favorable weather conditions had been forecast for the beginning of the window, which opened at 8:33 a.m. ET, but the weather changed as that time inched closer.
Vice President Kamala Harris, who traveled to Kennedy Space Center in Florida with second gentleman Doug Emhoff to watch the launch, underscored the United States' commitment to NASA's Artemis program in comments made after the postponement.
"While we hoped to see the launch of Artemis I today, the attempt provided valuable data as we test the most powerful rocket in history," Harris said via Twitter. "Our commitment to the Artemis Program remains firm, and we will return to the moon."
The 322-foot-tall (98-meter-tall) stack is sitting on Launchpad 39B at NASA's Kennedy Space Center in Florida.
NASA Administrator Bill Nelson addressed the scrub shortly after it was announced, stressing that Artemis I is a test flight.
"We don't launch until it's right," Nelson said. "They've got a problem with the gases going on the engine bleed on one engine. It's just illustrative that this is a very complicated machine, a very complicated system, and all those things have to work. You don't light the candle until it's ready to go."
It's something Nelson has personal experience with. As an astronaut, he was on the 24th flight of the Space Shuttle. It was scrubbed four times on the pad and the fifth try resulted in a flawless mission.
"Had we launched on any one of those scrubs, it wouldn't have been a good day," he said.
Several issues cropped up after the rocket began fueling after midnight.
Offshore storms with the potential for lightning prevented the team from beginning the fueling process, due to start at midnight, for about an hour.
The hold was lifted at 1:13 a.m. ET, and the tanking process began to load the rocket's core stage with supercold liquid oxygen and liquid hydrogen.
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