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space tug
A space tug is a type of spacecraft used to transfer payloads from low Earth orbit (LEO) to higher-energy orbits such as geostationary transfer, lunar transfer, or escape trajectory. The term is often used to refer to reusable, space-based vehicles, such as NASA's 1970s STS proposal〔
(【引用サイトリンク】url=http://www.astronautix.com/fam/spacetug.htm )〕 or the proposed Russian Parom, and sometimes used to refer to expendable upper stages,〔 such as Fregat,〔
(【引用サイトリンク】title=Fregat space tug )〕 or Spaceflight Inc.'s Sherpa.
==Background==
The space tug was first envisioned in the post-World War II era as a support vehicle for a permanent, Earth-orbiting space station. It was used by science fiction writer Murray Leinster as the title of a novel published in 1953 as the sequel to ''Space Platform'', another novel about such a space station.
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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