Science Quickly Why NASA is betting big on Artemis II moon mission
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Apr 3, 2026 Lee Billings, Scientific American’s senior space and physics editor, breaks down NASA’s Artemis II moon mission. He explains the Orion spacecraft’s lunar flyby and reentry risks. He covers mission systems tests from life support to radiation shelter. He discusses the program roadmap, lunar science goals at the south pole, and even the upgraded onboard toilet.
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Launch Succeeded After Fixing Hydrogen Leak Issues
- Artemis II launched smoothly after fixes to SLS propellant leaks and skipping a wet dress rehearsal.
- Lee Billings noted earlier leaks of liquid hydrogen were resolved, letting the rocket fill and go with an almost perfect liftoff.
Mission Is A Test With Critical Reentry Risk
- Artemis II is a test flight with high-tension maneuvers like translunar injection and a risky high-speed Earth reentry.
- Lee Billings warned translunar injection fires Orion's main engine for six minutes and reentry will hit ~25,000 mph, stressing the heat shield.
Steeper Reentry Chosen Instead Of New Heat Shield
- Artemis II uses the same heat shield as Artemis I but with a steeper, shorter reentry profile to reduce failure risk.
- Billings explained Artemis I showed unexpected heat-shield damage, so engineers changed the reentry angle rather than the shield.