All of this information gives scientists a picture of what the surface layer of dirt looks like now and whether or not it might have been a habitable area at some point in the planet's past.

所有的这些信息给科学家们展示了一幅土壤表层现在的图画，也说明了该星球在过去某一时间是否为一个适合居住的地方。

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And he says five of the planetary candidates are both close to the size of Earth and orbit in the habitable area of their parent stars.

VOA: special.2011.02.09