After their historic lunar flyby, the crew safely splashed down in the Pacific.
NASA's Artemis II mission lifted off on April 1 at 6:35 p.m. ET from the Kennedy Space Center in Florida.
The four-person crew completed a 695,081-mile, 10-day journey around the moon, also known as a lunar fly-by.
A "textbook" splashdown took place at 8:07 p.m. ET on Friday, April 10.
NASA has performed the final poll, with all teams giving a "go" for the Artemis II launch.
The agency has started the terminal count, which is the final 10-minute countdown before launch.
NASA's closeout crew has departed the launch pad after finishing its White Room procedures.
Currently, only the Artemis II astronauts -- Christina Koch, Reid Wiseman, Victor Glover Jr. and Jeremy Hanse -- remain in the Orion spacecraft at the top of the SLS rocket, ready for launch.
-ABC News' Briana Alvarado
NASA teams are troubleshooting an issue with the temperature of one of the batteries on the Launch Abort System.
NASA is reporting that the temperature is out of range for one of the two batteries. The agency says it is not a constraint for launch currently, but it will be if the issue continues when the temperature is checked during the final countdown minutes.
"Engineers investigated a sensor on the launch abort system’s attitude control motor controller battery that showed a higher temperature than would be expected. It is believed to be an instrumentation issue and will not affect today’s launch," the agency said in a statement.
-ABC News' Briana Alvarado
Transportation Secretary Sean Duffy said the Artemis II moon mission is "critically important" a few hours ahead of the scheduled launch.
"This is a moment that brings the country together," Duffy told Gio Benitez on ABC News Live.
"The technology, the time, the effort that has gone into making today possible is so cool," he added.
Duffy said the U.S. is in a race against China to get to the moon's South Pole. Currently, Artemis III is planned for 2028, while China’s space program is gearing up for a moon landing by 2030.
"There was a time that the adage was, ‘He who controls the seas controls the world.' Now it is, 'He who will control space will control the world,'" Duffy said. “We have to win. This is critically important."
