<P> 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 435 km ( 205 and 270 mi ) by means of reboost manoeuvres using the engines of the Zvezda module or visiting spacecraft . It completes 15.54 orbits per day . </P>
<P> 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 435 km ( 205 and 270 mi ) by means of reboost manoeuvres using the engines of the Zvezda module or visiting spacecraft . It completes 15.54 orbits per day . </P>
what is the height of the international space station orbit
what is the height of the international space station orbit
an altitude of between 330 and 435 km ( 205 and 270 mi )
an altitude of between 330 and 435 km ( 205 and 270 mi )