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September 30 2012
So-called "super-Earth" alien worlds may bear little resemblance to our own home planet and thus could be less likely to support life than previously believed, a new study suggests.
Super-Earths — alien planets bigger than Earth, but containing less than 10 times its mass — may be undifferentiated hunks of rock, possessing neither a mantle nor a core, researchers found. Super-Earths may also lack magnetic fields, which help protect life on our planet by shielding it from harmful radiation.
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