No one saw the Chelyabinsk meteor of February 15, 2013 coming—the largest asteroid to strike Earth in over a century. Just after sunrise on a sunny winter’s day, a 20-meter, 13,000-ton asteroid struck the atmosphere over the Ural Mountains in Russia at a speed of more than 18 km/s.
Click here for original story, Chelyabinsk a decade on: The sun’s invisible asteroids
Source: Phys.org