International Space Station
The International Space Station is a crewed research facility in low Earth orbit operated jointly by multiple national space agencies. Its orbital assembly began in 1998.
Aboard the International Space Station, tears don't stream down a face. In microgravity, surface tension makes them cling around the eye as a growing blob, blocking vision and causing pain if unwiped. Astronaut Chris Hadfield demonstrated it on the ISS in 2013.
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The International Space Station orbits Earth every 92 minutes, so its crew sees 16 sunrises and sunsets daily. A 45-minute day-night cycle would wreck their sleep — so astronauts keep window shades closed and run the station on Greenwich time, regardless of the light outside.
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