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SpaceX is about to send four people on a wild — and risky — mission into the radiation belts. Here’s what to know
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Volcano erupts in Russia after 7.0-magnitude earthquake, sending ash column 5 miles high
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Italy’s Mount Etna erupts again, sends ash plume 32,000 feet into sky
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Surprise blast of rock, water and steam sends dozens running for safety in Yellowstone
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Fast-growing California wildfires destroy homes, send residents scrambling for safety
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