NASA astronauts Suni Williams and Butch Wilmore, who have been stranded at the International Space Station since last June, started journey back to Earth aboard SpaceX's Dragon spacecraft early ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

在国际空间站中，有一组宇航员负责收集气象数据，进行科学实验。但其实，他们更多的时间，是用来观察：当你一天可以绕着地球飞行16圈，就有机会反复审视这颗寂静的蓝色星球——掠过大陆，四季更迭，涵盖冰川、沙漠、山脉之巅和海洋波涛，天上一日，抵过人间无数次壮观的美景。