These monumental blows can literally set moons rocking, said researcher Francis Nimmo, a planetary scientist at the University of California at Santa Cruz.

桑塔·克鲁兹加州大学的行星科学家，佛朗西斯•尼姆说，最不朽的碰撞使得月球完全摇摆不定。

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The hot core collapses and begins to pulsate, eventually shedding its outer layers of gas to set the stage for the birth of a planetary nebula.

恒星高温的核心坍缩，并开始有规律的振动，最终气体外层迸散，为行星星云的形成提供了有利条件。

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IT LOOKS like a planetary tattoo designed to be seen from space, a vast set of concentric circles inscribed in the skin of southern California's desert.

从太空遥看加州南部的沙漠，你可以观测到一个由许多同心圆组成的图案，犹如印在皮肤上的纹身一般。

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