cosmoquest.org

D18Er TIL that Uranus is the only planet that rolls horizontally as it orbits the sun, due to an early planetary collision that knocked it sideways

WkgLL TIL astronaut Wally Schirra would take pictures of his frozen pee as it floated through space, glinting with sunlight. The pee-flakes looked like a beautiful starfield, he said. One astronomer saw a photo & asked what constellation it was, and Schirra said "Jocelyn, that's the constellation Urion."

e0loE TIL that John Glenn, the first American to orbit the earth, spotted a cloud of strange glowing “fireflies” on his second orbit. Later NASA confirmed that the fireflies were simply droplets of his own urine that had been expelled from his craft during his previous orbit.