...When an artificial satellite or spacecraft enters the atmosphere of a planet from outer space. It is often simply called reentry. The reentry process uses the atmosphere as a cushion for the craft falling at a very high speed, allowing it to safely reach the Earth's surface and return to Earth, but it also involves problems such as aerodynamic heating and high deceleration, and countermeasures against these are always one of the most important issues. The trajectory during reentry is broadly divided into lift trajectory and ballistic trajectory depending on whether the craft has lift or not. ... *Some of the terminology explanations that mention "reentry" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…人工衛星や宇宙船が宇宙空間から惑星の大気層に突入すること。単に再突入reentryという場合も多い。再突入過程は,非常に大きな速度で落下していく機体に対して大気層をクッションとして利用し,無事に地表面などに到達,帰還させるものであるが,同時に空力加熱や高減速度といった問題も含んでおり,その対策はつねに重要な課題の一つとなっている。 突入中の経路は,機体の揚力の有無によって揚力軌道と弾道軌道に大別される。… ※「reentry」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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