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The 60-mile diameter Manicouagan impact feature in Canada

Defending the Earth

As astrophysicist Neil deGrasse Tyson has pointed out, we live in a cosmic shooting gallery. Less than a year ago a good-sized chunk of cosmic rock exploded over the Russian city of Chelyabinsk with a force of over 400 kilotons – over 30 times as powerful as the bomb that flattened Hiroshima. The impact was […]

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