美国宇航局发现火星上有存在水的可能

NASA scientists believe they've discovered flowing water on Mars which may have the ability to sustain living organisms. In the middle latitudes of the planet's southern hemisphere, water appears to flow off the edges of craters. Dark, finger-like features appear to extend down some Martian slopes during late spring through summer, before fading in winter and returning the following spring.
美国宇航局的科学家们认为他们已经发现火星上的流体水，这可能可以支持生命体。在火星南半球的中纬度地区，似乎有水在火山口的边缘流动过。从晚春至夏季，手指形状的阴暗特征似乎从火星的一些斜坡向下延伸，这样的地貌到冬季就消失，来年春天再次显现。

Repeated observations have tracked the seasonal changes in these recurring features on several steep slopes. The water is thought to be salty and therefore highly resistant to freezing at normal mid-latitude Martian temperatures. While scientists have had evidence of water on Mars for years, the previous general conclusion was that it was all frozen. This is the first time there is evidence that the water is occasionally flowing.
反复观察已发现了一些陡坡上这种循环特征的季节性变化。人们认为水是含盐的，因此在火星中纬度地区的正常温度下不会结冰。尽管科学家多年来一直都有证据证明火星上有水，但是之前普遍认为水全都结成冰。这是第一次有证据证明水有时是在流动的。