During Apollo 7, astronaut Donn Eisele's sextant star sightings were sometimes obscured by flurries of vented, frozen urine crystals.
Notes on verification
Confirmed by NASA official mission history and current NASA Apollo 7 page, corroborated by Astronautix and independent retrospective outlets. [tier=gold indep_score=0.867 clusters=3 claim_tier=notable]
Sources
- The Flight (and Fights) of Apollo 7 - Smithsonian Magazine (seed:science_and_space)
- http://www.astronautix.com/a/apollo7.html (corroboration)
- https://history.nasa.gov/SP-4029/Apollo_07a_Summary.htm (corroboration)
- https://www.nasa.gov/missions/apollo/about-apollo-7-the-first-crewed-apollo-space-mission/ (corroboration)
- https://newatlas.com/apollo-7-anniversary-space-mutiny/56648/ (corroboration)