Space Debris
1. Space debris are artificial objects which goes around the earth without any purpose
2. For example, there is the piece of broken rocket or satellite.
3. They are increasing year by year.
4. The contact with space debris is very dangerous, because they move at about 5 kilometers per second.
5. Space debris have become the environmental problem of space.
6. The environmental problem is serious not only on the earth but in space as well.
Source:http://ja.wikipedia.org/wiki/スペースデブリ
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