The Morning a Meteor Exploded Over Chelyabinsk
On February 15, 2013, a house-sized asteroid exploded over a Russian city with 30 times the force of Hiroshima -- and nobody saw it coming.
At 9:20 on the morning of Friday, February 15, 2013, the sky over Chelyabinsk, Russia, caught fire.
Commuters were driving to work when a streak of light brighter than the sun ripped across the sky, trailing smoke. It was a space rock about 20 meters across -- the size of a house -- slamming into the atmosphere at some 40,000 miles per hour. About 14 miles above the city, the heat and pressure became too much, and the meteoroid exploded with the force of 400 to 500 kilotons of TNT: roughly 30 times the energy of the Hiroshima bomb.
The blast wave arrived moments later. Across Chelyabinsk, windows shattered by the tens of thousands, showering streets, schools, and offices with glass. More than 1,400 people were injured, the vast majority by flying glass from windows shattered by the blast. Over 7,200 buildings were damaged, at a cost of tens of millions of dollars.
And nobody had seen it coming. The asteroid approached from the direction of the Sun, invisible to telescopes until it was already burning through the sky. It was the largest object to strike Earth since the Tunguska event of 1908, and its arrival was a complete surprise -- captured first by dashboard cameras, not observatories. Instruments built to listen for nuclear tests picked up the explosion's infrasound as far away as Antarctica.
In the weeks that followed, scientists pieced together the story. A 20-foot-wide hole had been punched through the ice of nearby Lake Chebarkul; months later, in October, divers raised a 540-kilogram fragment of the meteorite from the lakebed. Researchers concluded the rock had been a perfectly ordinary stony meteorite -- just an unusually large one, arriving at an unusually bad angle over an unusually populated place.
By cosmic coincidence, the very same day, an unrelated asteroid called 2012 DA14 passed within 17,200 miles of Earth -- one of the closest approaches ever recorded. The two events had nothing to do with each other, but the pairing made February 15, 2013, the day the whole planet looked up.
Chelyabinsk was a warning written in broken glass. It proved that city-shaking destruction can arrive without notice from a rock no telescope was watching -- and it is why astronomers now scan the skies with new urgency for the next one.
No photograph could be verified under a free license for this story, so it runs without a main image.
