But on the moon such geologic features usually occur following collapses of lava tubes, which formed long ago in the moon's history.

但是在月球上，这些地质特征却往往是伴随着熔岩管(很久以前就已经出现在月球上了)崩塌而出现的。

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And all those billions of years ago, scientists believe that microbes formed some distinctive features in the Pilbara rocks - features called "stromatolites" that can be seen and studied today.

科学家们相信，数十亿年前，Pibara岩群含有细菌形成的独特特征—即如今看到和研究的“叠层石”的特征。

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The studies will help scientists figure out what features on Mars were formed by processes that are no longer active.

这项研究将帮助科学家们弄清楚，哪些火星表面的特征是由已经不再活跃的过程形成的。

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The researchers will monitor the growth of this vegetation around newly formed thermokarst features and use experimental field plots to test how conditions mimicking such features affect which species will thrive.

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"Part of understanding Mount Sharp is understanding the context around it and some of the features that have formed on the plains where we're at, " Vasavada said.

CNN: Mars rover could start moving in a week

By Martian standards, these gullies appear to be young, since some of them have eroded features such as meteoritic craters that are known to have formed relatively recently.

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