The first component of the International Space Station (ISS) was launched into orbit back in 1998. The ISS is now the largest human made object in low Earth orbit and can at times be seen with the naked eye.
The ISS consists of pressurized modules, external trusses, solar arrays, and other components. ISS components have been launched by Russian Proton and Soyuz rockets, and American Space Shuttles.
The ISS serves as a micro-gravity and space environment research laboratory in which crew members conduct experiments in biology, human biology, physics, astronomy, meteorology, and other fields.