Double asteroid impact: Site in Sweden may show binary impact on Earth.
Two Asteroids May Once Have Hammered Earth Together (Video) 
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March 24 2014 4:52 PM

Once Upon a Time, Two Asteroids Hit Earth

Is this ancient site our first true “doublet”?

A pair of Swedish craters 10 miles away from each other seem to match in composition and age, dating back about 450 million years. 

Paca Thomas is a regular video contributor to Slate.

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