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List of spacecraft called Sputnik
''Sputnik' (Спутник)', a Russian word meaning "satellite" or literally "fellow traveler", is a name applied to certain spacecraft launched under the Soviet space program. "Sputnik 1", "Sputnik 2" and "Sputnik 3" were the official Soviet names of those objects, while the remaining designations in the series ("Sputnik 4" and so on) were not official names, but were names applied in the West, to objects whose original Soviet names may not have been known at the time.
==Spacecraft officially named ''Sputnik''==
* Sputnik 1, the first artificial satellite to go into orbit, launched 4 October 1957
* Sputnik 2, the first spacecraft to carry a living animal (the dog Laika), launched 3 November 1957
* Sputnik 3, a research satellite launched 15 May 1958
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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