艺术构想图展示了42亿年前早期地球和火星内部产生的&#309 (IMAGE)

Proceedings of the National Academy of Sciences

艺术构想图展示了42亿年前早期地球和火星内部产生的&#309

Caption

艺术构想图展示了42亿年前早期地球和火星内部产生的磁场。地球发动机（geodynamo）的长期存在以及磁力的保护让地球得以保存海洋，而火星磁场的坍塌使水无法存留。

Credit

Illustration courtesy of Michael Osadciw (University of Rochester, Rochester, NY) and and John A. Tarduno.

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