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Environment
US states sue over global warming
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Tsunamis of gas hot up galaxy clusters
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Astronomers pinpoint date of first marathon
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Spacecraft set to probe Mercury’s mysteries
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Seas absorb half of carbon dioxide pollution
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Asteroid impact debris can speed to Earth
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Dust worms hold the key to planet formation
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Sun storms reverberate to Solar System’s edge
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Life unlikely in asteroid-ridden star system
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Extrasolar planet hunters eye Venus transit
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Time-reversal trick perfected for microwaves
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Magnetic fields flip nanotubes from metals to semiconductors and back
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