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The International Space Station (ISS) is a research facility currently being assembled in space. Assembly of ISS began in 1998. The space station is in a low Earth orbit and can be seen from Earth with the naked eye, it has an altitude of approximately 350 km (217 mi) above the surface of the Earth, and travels at an average speed of 27,700 km (17,210 statute miles) per hour, completing 15.77 orbits per day..
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