New evidence suggests that a comet explosion over North America may have triggered a massive wave of destruction nearly 13,000 years ago, killing off mammoths and mastodons and wiping out one of the ...
In 2005, NASA carried out one of the most unusual experiments ever attempted in space. A spacecraft called Deep Impact released a probe that slammed into Comet Tempel 1 at 37,000 km/h, triggering an ...
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