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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 Space elevator economics ： ウィキペディア英語版 Space elevator economics Space elevator economics compares the cost of sending a payload into Earth orbit via a Space elevator with the cost of doing so with alternatives, like rockets. ==Costs of current systems (rockets)== The costs of using a well-tested system to launch payloads are high. Prices range from about $4,300/kg for a Proton launch to about US$40,000/kg for a Pegasus launch (2004). Some systems under development, such as the SpaceX Falcon Heavy, offer rates as low as $1,600/kg. Various systems that have been proposed have offered even lower rates, but have failed to get sufficient funding (Roton; Sea Dragon), remain under development, or more commonly, have financially underperformed (as in the case of the Space Shuttle). (Rockets such as the Shtil-3a, which offers costs as low as $400/kg, rarely launch but it has a comparatively small payload, and is partially subsidized by the Russian navy as part of launch exercises.〔) Rocket costs have changed relatively little since the 1960s, but the market has been very flat.〔 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「Space elevator economics」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.