A planet 20 light years away is the first outside our solar system to be officially declared habitable by scientists.The 'exoplanet' Gliese 581d has conditions that could support Earth-like life, including possible watery oceans and rainfall.Yet any future space voyagers landing there would find themselves in truly alien surroundings. The sky is likely to be murky red, not blue, and gravity is twice what is on Earth, doubling the weight of anyone standing on the surface
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