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Science Fallout from the Russian fireball encircled Earth, research shows

The meteor that exploded near Chelyabinsk, Russia on February 15 created a mushroom cloud of microscopic dust grains that spread across the sky, encircling the planet within four days.

By Correspondent / August 19, 2013

Courtesy of NASA/Goddard

Six months ago, Russians watched a massive fireball streak across the sky. The sperm-whale-sized asteroid exploded before it hit the ground, shaking the air and land with as much force as a 440-kiloton nuclear bomb and shattering into countless rocks, shards, grains, and dust-sized particles.