On February 2006 a very peculiar Satellite was launched from the ISS. SuitSat was an empty spacecuit that belonged to a retired Russian astronaut with a radio transmitter mounted on its helmet. It stayed in orbit for 7 months before re-entering the Earth's atmosphere. pic.twitter.com/tfk7STyTpI
Mars' Olympus Mons, the tallest known volcano in the solar system, has such a gradual slope that someone standing at the base couldn't see the summit because it's beyond the horizon. pic.twitter.com/cKjWpKGhIR