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Science Realm
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Science Realm : ウィキペディア英語版
Science Realm
Science Realm is a United States Government project with the aim of creating a vertical-takeoff horizontal-landing (VTOHL) single stage to orbit (SSTO) craft, the term is also associated with the software this project uses to simulate takeoff and landing.〔(Past US stealth aircraft projects )", Retrieved 24 April 2010〕
==Science Dawn==
Science Realms predecessor Science Dawn was a classified program to build a rocket-launched supersonic horizontal-take off horizontal-landing (HOTOL) SSTO spaceplane. However, it became clear that horizontal takeoff requirement was an inappropriate application of rocket thrust-to-weight ratio; the angle and relative size of rocket and earth meant the path of least effort was almost completely vertical (completely against gravitation). Consequently, SCIENCE DAWN ended, and the focus transferred to SCIENCE REALM.〔"(GLOBSEC on Science Dawn )", ''GlobalSecurity.org'', Retrieved 24 April 2010〕〔Aviation Week & Space Technology on October 11, 1993.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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