Letters From Our Readers, April 6, 2026

Orion spacecraft on Space Launch System
Credit: Sam Lott/NASA
Shield Specs “Leaving Earth Orbit” ( Feb. 23-March 8, p. 36 ) does not mention that for the Orion structure, NASA did not use brazed stainless steel like the Apollo program did. Instead, the Avcoat was attached to low-melting-­temperature aluminum with epoxy. NASA also apparently did not want to...

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