Scientists want to bring a chunk of the red planet down to Earth on what's called a sample-return mission.

科学家们希望将这颗红色星球的一大块带回地球，进行所谓的取样返回任务。

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If and when we bring back a coffee-cup-size sample from Mars in 2018, it will also need Earth-bound scrutiny.

在2018年，我们是否以及何时从火星上取回一个咖啡杯大小的样本，这也将需要我们地球人的审议。

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We very absolutely shocked when we found that not only it's not similar, but unlike the Earth where every sample is essentially the same, here we're getting these enormous differences.

我们非常震惊，当我们发现氯元素的比例不仅仅是不相似，而且不像地球上那样每个样本在本质上是一样的，在这里我们一直都在得到巨大的差异。

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If SAM does spy a potential organic, it will aim to determine if it's actually from Mars, or hitchhiking strays from Earth contaminating the sample collector.

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At the same time it was activated in space, a control sample was activated here on Earth.

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Such depths are commonplace when sample cores are drilled out of the earth's crust by geologists.

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