NASA火星探测器的火星矿物研究显示火星上曾经有水流动，但是这些水含有大量的盐和酸。 这就增加了火星是否曾经支持生命存在的疑虑。
Minerals on Mars studied by the NASA rovers suggest water once flowed on the planet's surface, but was very salty and acidic, raising doubts about whether it could have supported life.
连续测量的水流速度是通过不同源距探测器计数率的比值来确定。
Water-flow velocity of continuous measurement was determined by the ratio of count rate value of different source spacing detectors.
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