This big splat is a low-velocity collision, " said study co-author Erik Asphaug, a planetary scientist at the University of California, Santa Cruz.

也没办法避免……双月碰撞属于低速碰撞，”圣克鲁兹州加利福尼亚大学天体科学家兼本次研究论文撰写者埃里克·埃斯帕格说。

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This big splat is a low-velocity collision," said study co-author Erik Asphaug, a planetary scientist at the University of California, Santa Cruz.

也没办法避免……双月碰撞属于低速碰撞，”圣克鲁兹州加利福尼亚大学天体科学家兼本次研究论文撰写者埃里克·埃斯帕格说。

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"It's been puzzling why previous estimates for the planet's interior have been so dry, " co-author Erik Hauri of the Carnegie Institution of Washington said in a statement.

MSN: Scientists say parts of Mars interior are as wet as Earth's