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How Sentinel will hunt for hidden asteroids

Asteroids of various sizes whiz past our planet all the time. Some we know about, but many we don't, and new ones are identified on an almost weekly basis. (In fact one such recently-discovered asteroid named 2014 HQ214, ...

dateJun 06, 2014 in Space Exploration
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Volcanic ash can threaten air traffic

The presence of volcanic ash in the upper atmosphere presents multiple threats to aviation. It not only reduces visibility and abrades the exposed areas of the aircraft, the fine particles can also endanger the operation ...

dateJun 04, 2014 in Earth Sciences
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