the international space station [iss] is a space station,or a habitable artificial satelite,in low earth orbit.its first component launched into orbit in 1998,and the iss is now the largest human-made body in low earth orbit and can often be seen with the naked eye from earth.the iss consists of pressurised 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 microgravity and space environment research laboratory in which crew members conduct experiments in biology,human biology,physics,astronomy,meteorology,and other fields.
the station is suited for the testing of spacecraft systems and equipment required for missions to the moon and mars.the iss maintains an orbit with an altitude of between 330 and 435km [205 and 270mi] by means of reboost maneuvres using the engines of the zvezda module or visiting spacecraft it completes 15.54 orbits per day.