Double asteroid impact: Site in Sweden may show binary impact on Earth.

Two Asteroids May Once Have Hammered Earth Together (Video) 

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.