China's longest manned space mission and a significant step ...
A communications method that uses pulsed laser beam to send ...
Apollo 1 tragedy happened during the test,with the Command ...
The Space Launch System is an extra large and heavy launch ...
Apollo-13 was the third planned Lunar-landing mission after ...
北京,中华人民共和国首都、直辖市和国家中心城市,中国的政治、文化、科教和国际交往中心,中国经济、金融的决策和管理中心,中 ...
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