It was created by a catastrophic collision between our planet and a Mars-size body over 4 billion years ago.

4亿年前，一个火星大小的天体和地球发生了灾难性的碰撞从而产生了月亮。

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Of Parrots And People: The Sometimes Funny, Always Fascinating, And Often Catastrophic Collision Of Two Intelligent Species.

鹦鹉和人类：有时滑稽，总是迷人，两个智能物种经常的灾难性碰撞。

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If all we do is change our light bulbs to compact fluorescents, we will face a catastrophic collision with reality.

FORBES: Alex Steffen