Dr Grotzinger is the chief scientist for NASA's Mars Science Laboratory mission, whose rover, Curiosity, landed on the planet last year.

格罗青格博士是NASA火星科学实验室任务的首席科学家，该任务的漫游车——好奇号于去年在火星着陆。

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Grotzinger said another reason they chose Gale as a landing spot is because it is in a low-elevation position - and water runs downhill.

格勒青格说，他们把盖尔坑选为登陆点的另一个原因是因为它的海拔高度低，要知道水往低处流嘛。

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The surface may not have been wet for all of that period, notes Dr Grotzinger, but groundwater could have persisted even when the surface was temporarily dry.

在那一时期，火星地表或许不会一直都有水存在，格罗青格博士指出，但会存在地下水，即便地表暂时干涸。

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Now fifty-five, Grotzinger has worked in Siberia, Namibia, Oman, and Arctic Canada, among other locations.

NEWYORKER: The Martian Chroniclers

Grotzinger often takes his geology students there, to a field school run by Caltech.

NEWYORKER: The Martian Chroniclers

At first, Grotzinger thought of the crater as nothing but a runway for the rover.

NEWYORKER: The Martian Chroniclers