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Now have a young person drop rocks onto the moonscape.
現在，讓一位年輕人往“月球表面”上扔石頭。
When it hits, the energy of the falling rock is transferred to the powdery surface, and voila! Impact crater.
當石頭撞擊表面時，石頭下落的勢能會在粉狀表面轉化成撞擊力，瞧！隕石坑出現了。
Instead of just doing it at random, though, have your young person drop one rock from a height of two feet, another from four feet, and another from six feet.
不要隨意地投擲石頭，先從兩英尺的高度往下扔，然后再從四英尺的高度扔，最后從六英尺的高度再扔一次。
You’ll find that the craters change shape depending on the energy of the incoming meteorite.
你會發現，隕石坑的形狀會隨著隕石的勢能而改變。
Higher-energy impacts make wider craters, with debris shooting out from their centers in what are called “rays.”
能量越大，形成的隕石坑就越大，隕石坑中心受到撞擊后碎片如射線般四處飛濺。
Smaller ones look like little volcanoes. Throwing a stone at an angle makes an oblong crater.
較小的隕石坑看起來像小火山。以傾斜的角度扔石頭會形成橢圓形的隕石坑。
Afterward, take a look at the moon again through binoculars when it rises.
以后等月亮升起時，再用望遠鏡仔細觀察。
You may have a better sense of what all those pock-marks really are!
你可能就會對月球上的這些“凹坑”有更深刻的認識了。
譯文為可可英語翻譯，未經授權請勿轉載!
