“The meteorite that struck the Russian region of Chelyabinsk was several meters in diameter, weighed around a dozen tons and had the energy of several kilotons, experts from the Russian Academy of Science say.

According to their estimates, the space object entered the atmosphere at a speed of 15-20 kilometers per second and burst into flames some 30-50 kilometers off the ground reports the Voice Of russia.

The fragments of the asteroid left a blazing trail in the sky and caused a strong hit wave. Most of the debris evaporated, while the remaining fragments froze over and could have come down as meteorites, scientists explained.” http://beforeitsnews.com/space/2013/02/videos-asteroid-destroys-factory-130-students-injured-by-meteor-blast-modern-tunguska-event-terrifies-russia-2454400.html