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by kens 53 days ago
That claim is from NASA: https://www3.nasa.gov/centers/kennedy/pdf/566250main_SHUTTLE...
1 comments

I see that. And I see it repeated all over. Still skeptical.

Googling for total part count also comes up with the 2.5M number. They move WRT Earth, but the vast majority do not move with respect to each other, is my guess.

For a sanity check comparison: Saturn V estimates are ~5 million total parts, and "tens of thousands" of moving parts. A ratio that sounds sort of normal.

everything can be a moving part if you use enough hydrogen and oxygen