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Within supersized alien versions of Earth, a common transparent ceramic may become a flowing liquid metal, perhaps granting those distant worlds magnetic fields to shield life from harmful radiation, researchers say.

Among the hundreds of extrasolar planets, or exoplanets, that astronomers have discovered in recent years are so-called "super-Earths," which are rocky planets like Earth but larger, at up to 10 times its mass. Scientists have discovered super-Earths that may support oceans of water on their surfaces on their surfaces, and others that may even be planets made of diamond.