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The countries are constructing the iss piece by piece in space. It is very big and heavy, so they can only construct it in microgravity. The first part of the ISS was Zarya, the control module, which was built by Russia. It was launched into orbit by Proton rocket from Baikonur Cosmodrome on 20 November 1998. A few weeks later tthe US module Unity was launched. The two modules were connected in space. This was the beginning of a space station that will have more than 70 parts, and where seven astronauts will live and work. But while building is going on,only three astronauts will live and work on the station.
The station begins a new era in space exploration. The ISS will orbit the Earth, and people will live and work in space for several months. The station will be an orbital laboratory for scientific research in physics, chemistry, biology, medicine, human physiology, space and Earth science. We will learn many new things about how to live in space. And one day this new knowledge will help us to explore other parts of our solar system.