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The shape and perigee of artificial satellite orbits shall continually variate due to caused by the atmospherical drag and the earth gravity.

人造地卫星轨道气阻力和地引力场等因动,其形状和近地点位置将不断改变。

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On October 4,1957, when Sputnik went into orbit, people were so upset.

1957 年 10 月 4 日,当人造卫星进入轨道的时候人们异常不满。

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VOA Special 2018年8月合集

The first artificial Earth satellite in the world has now been created. This first satellite was today successfully launched in the USSR.

第一颗人造卫星已经天,苏联成功发射第一颗卫星。”

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天文学百科 The Astronomy Book (Big Ideas Simply Explained)

Jocelyn Bell Burnell The launch in 1957 by the Soviet Union of the first artificial Earth satellite, Sputnik 1, was a turning point in history, both politically and scientifically.

乔斯林·贝尔·伯内尔 1957年, 苏联发射了首颗人造卫星“斯普特尼克1号” ,这一事件在历史具有转折意义,无论是在政治层面还是科学领域。

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