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In the four decades since our robots first arrived, the once fussy ball at the end of our telescopes has steadily focused into a red planet we can understand. 1.………………（一个飘号，一个逗号，2个句号）………… You might see some fine wispy clouds high in the sky, but don't bother bringing an umbrella. The whole planet is drier than the dustiest desert on earth. And there hasn't been a drop of rain here for millions, perhaps billions, of years. "The thing that fascinated me was that we could see valleys, sneaking across the surface, had clearly been curved by flows of water. So this is telling us that in the past, it was different. Not only that, it was different in a way that would make it more suitable for life than it is today. And that I found truely compelling."

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