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Comet 46P to glow green in weekend sky during close encounter with Earth
This weekend will feature an uncommon scene in the night sky as a comet glides past the Earth.
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Large-scale eruption of Italy's supervolcano could impact global climate
The volcanic area west of Naples, Italy, is stirring with early signs of a new caldera cycle for one of the world's most menacing supervolcanoes, according to new research.
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