"It's 13 minutes of things that have to go right, said NASA's Artemis II flight director Jeff Radigan on Thursday at a news briefing. The final moments of reentry are critical for the safety of the crew."
"During the unmanned Artemis I mission in 2022, engineers discovered more than 100 locations on the Orion heat shield that had cracked and broken off during reentry. This was not the intended design of the shield."
"As the capsule dipped into the atmosphere, internal layers became scorching hot through a process called pyrolysis, trapping gas. This led to a dangerous situation during the second descent."
"The Artemis II has, remarkably, an even less permeable shield than the one on Artemis I, meaning the same failure mode was even more likely to occur, raising concerns about the safety of the mission."
The Artemis II mission, after a historic lunar loop, encountered significant danger during the final 13 minutes of reentry. NASA's Artemis II flight director highlighted the critical nature of this phase. The Orion spacecraft's heat shield had previously shown flaws during the unmanned Artemis I mission, with over 100 cracks discovered. The issue stemmed from internal pressure causing pyrolysis, leading to gas entrapment. During reentry, this pressure burst caused chunks of the shield to break off. Despite improvements, the Artemis II shield remains susceptible to similar failures.
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