The International Space Station (ISS) is a research facility developed internationally are currently located in low Earth orbit. On-orbit construction of the station began in 1998 and is scheduled for completion in 2011, with operations continuing until at least until 2015. just like the moon, the station can be seen from Earth with the naked eye, this is the largest man-made orbiting ever in history.
ISS serves as a long-term research in the laboratory, and is the site of daily experiments in the fields, including biology, human biology, physics, astronomy and meteorology, conducted in the microgravity environment. The station provides a safe location for testing the efficient, reliable spacecraft systems that will be needed for long-term missions to the Moon and Mars.