Follow NASA's Artemis 1 moon rocket launch update today (Sept. 23) – Space.com

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The briefing will begin at 12:30 p.m. ET.
NASA will provide an update about its Artemis 1 moon mission today (Sept. 23), and you can listen live.
The Artemis 1 press briefing is scheduled to start at 12:30 p.m. EDT (1630 GMT). You can listen here at Space.com, courtesy of NASA, or directly via the space agency (opens in new tab). (It appears the briefing will be audio-only.)
Participating in the call will be:
Related: NASA’s Artemis 1 moon mission: Live updates
More: 10 wild facts about the Artemis 1 moon mission
Artemis 1 is the first mission of NASA’s Artemis program of moon exploration. It will use an SLS megarocket to launch an uncrewed Orion capsule on a long journey to lunar orbit and back.
NASA tried to launch Artemis 1 on Aug. 29 and Sept. 3 but was foiled by glitches both times. The Sept. 3 issue was a leak of liquid hydrogen propellant, which the mission team addressed by replacing two seals at the affected area, a “quick disconnect” linking the SLS core stage with a fuel line from its mobile launch tower.
The Artemis 1 team performed a fueling test on Wednesday (Sept. 21), and the fix held; the team detected a leak but managed to bring it down to manageable levels. All the objectives were met during Wednesday’s test, so “teams are fine-tuning procedures for the next launch opportunity, targeted for no earlier than Sept. 27,” NASA officials wrote in an update (opens in new tab) on Thursday (Sept. 22).
Today’s press briefing will give us more details about those procedures and the mission team’s plans going forward.
NASA’s Artemis program of lunar exploration 
Artemis 1: Going back to the moon 
NASA’s Artemis 1 moon mission explained in photos 
Those plans are contingent on several factors in addition to the leak repair. For example, NASA has applied for a waiver from the U.S. Space Force to extend the certification of the Artemis 1 flight termination system (FTS), which is designed to destroy the SLS if something goes wrong during launch. (The Space Force oversees the Eastern Range for rocket launches.)
The FTS was certified for 25 days and has exceeded that deadline. If the waiver isn’t granted, NASA will have to roll the Artemis 1 stack off its launch pad at Kennedy Space Center in Florida back to the facility’s huge Vehicle Assembly Building for recertification. 
Then there’s the weather, which is always a concern on Florida’s hot and stormy Space Coast. 
Mike Wall is the author of “Out There (opens in new tab)” (Grand Central Publishing, 2018; illustrated by Karl Tate), a book about the search for alien life. Follow him on Twitter @michaeldwall (opens in new tab). Follow us on Twitter @Spacedotcom (opens in new tab) or on Facebook (opens in new tab).  
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Michael Wall is a Senior Space Writer with Space.com (opens in new tab) and joined the team in 2010. He primarily covers exoplanets, spaceflight and military space, but has been known to dabble in the space art beat. His book about the search for alien life, “Out There,” was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor’s degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.
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