We think the Mars is a lifeless planet.

我们认为火星是一个没有生命的星球。

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And today many scientists think that all of the alleged signs of life in the rocks could have just as easily been made on a lifeless planet.

而今，大多数科学家认为，岩石上所有已知的生命迹象都能够轻易地在一个无生命的星球发生。

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That planet is probably lifeless.

那颗行星上可能没有生命。

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Indeed, images of the dry, parched, arid, almost certainly lifeless surface of another planet lit up Twitter like a Christmas tree.

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The planet today is cold, arid and lifeless, bathed in sterilizing radiation.

WSJ: Scientists Say Microbial Life Was Possible on Mars