＜正＞20 light years away from our solar system, there is a planet called"Gliese 581d"which has conditions that could support Earth-like life, including possible oceans and rainfall.On May.19, 2011,the planet has been the first to be officially declared habitable by French scientists. Glises 581d is truly different from the Earth. The sky is likely to be red,not blue,the gravity is
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