NASA is preparing to crash a probe into an asteroid some 11 million kilometers from Earth to assess how difficult it would be to stop a sizable piece of space rock hitting our planet.

美国国家航空航天局正准备将一枚探测器撞向距离地球约1100万公里的一颗小行星，以评估阻止一块大太空岩石撞击地球的难度。