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 ...
Skybox Imaging is a private company providing commercial ...
The Mars One Foundation is a not-for-profit organisation ...
Also called Explorer 81, it is the sixth mission in the ...
A futuristic British space plane engine that burns hydrogen ...
Was the first spaceflight in the Vostok program and the ...
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