Earth

Up to 2% of Earth’s oldest mantle is made of diamond

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First Earth-Size Planet Is Discovered in Another Star’s ‘Habitable Zone’

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NASA: Vitamin B3 Might Have Been Made in Space, Delivered by Meteorites

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New Study Outlines ‘Water World’ Theory of Life’s Origins

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Saturn’s hexagon: An amazing phenomenon

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Chance meeting creates celestial diamond ring

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Permafrost thawing could accelerate global warming

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NASA’s OCO-2 Brings Sharp New Focus on Global Carbon

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Astronauts’ hearts become more spherical in space

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Will the Yellowstone supervolcano erupt in our lifetime?

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How the West Gets Drier

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Scientists solve riddle of celestial archaeology

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