TAKE 27 LTD / SCIENCE PHOTO LIBRARY TAKE 27 LTD / SCIENCE PHOTO LIBRARY
Early Earth-like planet. Computer artwork of an alien (extrasolar planet), showing silicate crystals on its surface. As Earth-like planets cool, reduction reactions within the convecting system result in the production of a metal-rich core and a silicate-rich crust-mantle structure. Since silicon is similar to carbon, it has been suggested that it might be possible for silicon-based lifeforms to evolve.
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