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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This is the first asteroid sample return mission.

这是首个收集小行星样本的任务。

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was supposedly going to be a return mission to the moon followed by a trip to Mars.

据称乔治•布什时代的星座项目是继火星之旅后将是一个恢复到月球的任务。

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It is the first US sample-return mission since the last Moon landing in 1972.

BBC: Probe set for asteroid flyby

Launch failures claimed nearly half of Russia's probes, including the ambitious Phobos-Grunt sample return mission last year.

MSN: History littered with failed Mars probes

If there were organic molecules on Mars, a sample-return mission might head to the planet after all if not in 2016, then 2018 or 2020.

NEWYORKER: The Martian Chroniclers