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金沙网站登录:Mars on ice

发布时间:2019-03-06 14:19:15来源:未知点击:

By Melanie Cooper WHILE Mars shows off its rusty face in the evening sky this month—during its closest approach to Earth in more than a decade—images captured by the Mars Orbiter Camera suggest that ground ice was present in the Red Planet’s soil only 10 million years ago. That’s just a moment ago in geological terms. The pictures suggest that there were once ice deposits near Mars’s equator, probably no more than 5 metres below the surface. “If ground ice was present within 5 metres of the surface only a few million years ago,