International Space Station: A Home in Orbit

The International Space Station (ISS) is the largest human-made structure in space.
It orbits Earth every 90 minutes at about 250 miles (400 km) above the surface.
Construction began in 1998, with contributions from 15 nations.
The ISS is roughly the size of a football field.
Astronauts and cosmonauts live and work there for months at a time.
It serves as a microgravity laboratory for science, medicine, and technology.
Crews conduct research ranging from human health to new materials.
The ISS has been continuously inhabited since November 2000.
Cargo ships from NASA, SpaceX, Roscosmos, and others resupply the station.
The ISS is a model of international cooperation, uniting space agencies worldwide.