International Space Station is the biggest object ever flown in space and flies about 320 kilometres above the Earth.
ISS is a partnership between European countries (represented by ESA), the United States (NASA), Japan (JAXA), Canada (CSA) and Russia (Roscosmos).
15 countries including the US, Russia, Japan, and Canada took 10 years and more than 30 missions to assemble the ISS.
The main construction of ISS was completed between 1998 and 2011 and has been continuously occupied since 2000.
Astronauts and cosmonauts regularly conduct spacewalks for ISS's construction, maintenance and upgrades.
The ISS travels around the Earth at an average speed of 27,700 km/h and completes 16 orbits in 24 hours.
The permanently crewed platform is 356 feet (109 meters) end-to-end, approximately the size of a football field, and weighs about 460 tons.
Eight spaceships can be connected to the International Space Station at once. A spacecraft can arrive at the ISS as soon as four hours after launching from Earth.