Two Asteroids May Once Have Hammered Earth Together (Video) 

Slate in motion.
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.