They stay in "space" for a (relatively) long time, allowing for long term studies of materials and human physiology in microgravity. These areas of research are essential for future deep space exploration. Space stations can also be used as testing platforms for new or experimental technologies used in space exploration. Finally, smaller ships can be assembled at space stations before launching to far-flung locations in space. Since space stations have already overcome the hardest part of the planet's gravity well, they serve as great stepping points to places like the Moon, Mars or beyond.

yes, the international space station was always called the ISS

The program that took astronauts to the moon was Apollo. It was not a space station.

It wasn't. It was built by and with the cooperation of several nations.

Yes the international space station is in the tropsphere

1o people per month.

One use of a space station is that space station's builds rockets and launch then to go to the moon. Another use is that they build mars rover's which can anylaze planets and maybe universes that we can't visit because we can't handle the temperture of certain planets or too far away that we won't make because DEATH.