On June 30, 1908, above a remote area of Siberia , a rock from space, about half a football field in size, estimated to be travelling at 33,500 mph impacted the atmosphere of earth at an altitude of about 5 miles. Because of the particular type of rock, in terms of density and composition, the pressure of impact caused the object to detonate. It is rare for such things to happen because the conditions have to be just right, from the angle of entry to the velocity and density of the object. The result of this event produced an explosion estimated to have been an unbelievable 185 times the force of the (28 kiloton) bomb that destroyed the city of Hiroshima, Japan in 1945.
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