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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Kessler syndrome ： ウィキペディア英語版 Kessler syndrome The Kessler syndrome (also called the Kessler effect,〔(【引用サイトリンク】title=The Danger of Space Junk – 98.07 )〕 collisional cascading or ablation cascade), proposed by the NASA scientist Donald J. Kessler in 1978, is a scenario in which the density of objects in low Earth orbit (LEO) is high enough that collisions between objects could cause a cascade—each collision generating space debris that increases the likelihood of further collisions. One implication is that the distribution of debris in orbit could render space activities and the use of satellites in specific orbital ranges unfeasible for many generations.〔 ==Debris generation and destruction == Every satellite, space probe, and manned mission has the potential to produce space debris. A cascading Kessler syndrome becomes more likely as satellites in orbit increase in number and old satellites become inoperative. As of 2014, there were about 2,000 commercial and government satellites orbiting the Earth. It is estimated that there are 300,000 pieces of space junk ranging from 1 cm to 25 cm, and on average one satellite is destroyed each year.〔 The most commonly used orbits for both manned and unmanned space vehicles are low Earth orbits, which cover an altitude range low enough for residual air drag to be sufficient to help keep the zone clear. Collisions that occur in this altitude range are also less of an issue because the directions into which the fragments fly and/or their lower specific energy often result in orbits intersecting with Earth or having perigee below this altitude. Orbital decay is much slower at altitudes where atmospheric drag is insignificant. Slight atmospheric drag, lunar perturbation, and solar wind drag can gradually bring debris down to lower altitudes where fragments finally reenter, but this process can take millennia at very high altitudes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Kessler syndrome」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.