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

一旦发现 “城市杀手” 级别的小行星可能撞击地球，我们必须采取措施阻止它。可以是通过技术将小行星击碎成无害碎片，使其避开地球；或使其在大气层中燃烧殆尽；也可以让小行星改变轨道，偏离与地球的碰撞路径。

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

歌手凯蒂·佩里和贝佐斯未婚妻搭乘Blue Origin火箭完成太空之旅 ...