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A planetary flyby is the act of sending a space probe past a celestial body close enough to record scientific data. 〔(【引用サイトリンク】title=Flyby | Define Flyby at Dictionary.com )〕 Flybys commonly use gravity assists to "slingshot" a space probe on its journey to its primary objective, but may themselves be used as primary means. ==1950s== * Luna 1 – 2 January 1959 – First lunar flyby and first Soviet lunar flyby (inadvertent; intended as impactor);〔http://space.skyrocket.de/doc_sdat/luna_e1.htm〕 first human-made object to reach heliocentric orbit * Pioneer 4 – 3 March 1959 – First successful lunar flyby and first American lunar flyby 〔https://www.youtube.com/watch?v=ypM2aOrl-YE〕 * Luna 3 – 4 October 1959 – Lunar flyby; first imagery of far side of Moon; first gravity assist; first lunar gravity assist 〔http://nssdc.gsfc.nasa.gov/nmc/masterCatalog.do?sc=1959-008A〕〔http://www.svengrahn.pp.se/trackind/luna3/Luna3story.html〕〔http://www.ianridpath.com/moon/moon1.htm〕 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「Planetary flyby」の詳細全文を読む スポンサード リンク
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