During Apollo 7, astronaut Donn Eisele's sextant star sightings were sometimes obscured by flurries of vented, frozen urine crystals.
Sources
- The Flight (and Fights) of Apollo 7 - Smithsonian Magazine (smithsonianmag.com)
- http://www.astronautix.com/a/apollo7.html (astronautix.com)
- https://www.nasa.gov/missions/apollo/about-apollo-7-the-first-crewed-apollo-space-mission/ (nasa.gov)
- https://galacticjourney.org/october-26-1968-phoenix-from-the-ashes-apollo-7/ (galacticjourney.org)
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