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[audioFiles]2015m8x/audio_ezfj_ezflisteningd_20157_071[/audioFiles]

游客2024-09-23  44
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答案                             Space Junk
    Space junk, also known as space waste, / is objects in orbit around the earth created by humans that no longer serve any useful purpose. / They consist of everything from entire spent satellites / to explosion fragments, deliberate insertion of small needles, and many other objects. / As orbits often overlap, the space junk is a potential collision risk for spacecraft. / (?) The vast majority of pieces of space junk are small particles. / Contact with these particles causes erosive damage. / The majority of the damage can be eased by adding a thin layer of metal / outside of the main spacecraft body. / However, certain portions of many satellites cannot be protected in this way, / the solar panels and windows for instance. / If a collision with larger pieces occurs, / many of the resulting fragments from the damaged spacecraft / will also be in the 1 kilogram mass range. / Consequently, these objects become an additional collision risk.
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