试题与答案

人类对离地球约1.35×1011m外的坦普尔一号彗星进行“深度撞击”的太空实验.

题型:填空题

题目:

人类对离地球约1.35×1011m外的坦普尔一号彗星进行“深度撞击”的太空实验.在撞击发生后,强光(如图所示)从彗星到地球表面的天文望远镜所需时间约______s(光在真空与空气中速度约为3×108m/s).但其撞击所产生的声音却永远不能传回地球,这是因为______.

答案:

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