1. Shuttle Discovery chased the international space station in orbit yesterday as its seven astronauts began a painstaking laser inspection of their ship's wings.
2. The International Space Station orbits the Earth at an altitude of approximately 360 km, a type of orbit usually termed as low Earth orbit.
3. Mir was a Soviet and later Russian space station, operational in low Earth orbit from 1986 to 2001.
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4. The samples will be returned to the ground for analysis, which will help determine if the station can safely remain in orbit beyond 2020.
5. Elements of a space station will be in orbit by 2011 before a robotic landing is attempted on the Moon two years later.
6. A spacewalking astronaut tossed two large chunks of junk off the international space station yesterday, hurling the old equipment into orbit.
7. The space station flies at a lower orbit than the collision course.