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}} ''Luna 2'' (E-1A series) was the second of the Soviet Union's Luna programme spacecraft launched to the Moon. It was the first spacecraft to reach the surface of the Moon, and the first man-made object to land on another celestial body.〔(【引用サイトリンク】title=Missions to the Moon )〕 On September 14, 1959, it successfully impacted east of Mare Imbrium near the craters Aristides, Archimedes, and Autolycus.〔 (【引用サイトリンク】 ''Luna 2'' )〕 Launch was scheduled for September 9, but the Blok I core stage was shut down after it failed to reach full thrust at ignition. The booster was removed from the pad and replaced by a different vehicle, delaying the flight by three days. ''Luna 2'', like ''Luna 1'', took a direct path to the Moon, a journey of around 36 hours. The Earth-Moon gravitational system forced it to follow a curved trajectory, and launch had to occur from the side of the Earth opposite the Moon. ''Luna 2'' hit the Moon about 800 kilometres from the centre of the visible disk 1959 September 13 at 21:02:24.〔(【引用サイトリンク】title=USSR ''Luna 2'' )〕 ''Luna 2'' was similar in design to ''Luna 1'', a spherical spacecraft with protruding antennas and instrument parts. The instrumentation was also similar to Luna 1, including scintillation counters, geiger counters, a magnetometer, Cherenkov detectors, and micrometeorite detectors. There were no propulsion systems on ''Luna 2'' itself.〔 ==Van Allen Radiation Belt== ''Luna 2'' showed time variations in the electron flux and energy spectrum in the Van Allen radiation belt. 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「Luna 2」の詳細全文を読む スポンサード リンク
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