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Water Discovered in Extrasolar, Rocky World

Water has been discovered for the first time on a piece of rocky debris 150 light years away from Earth. The debris, which is orbiting the white dwarf GD 61, is a relic of a planetary system that survived the burnout of its parent star. Scientists think the system had the potential to contain Earth-like exoplanets. "These water-rich building blocks, and the terrestrial planets they assemble, may in fact be common. A system cannot create things as big as asteroids and avoid building ...

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