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"The Tunguska event, or Tunguska explosion, was an enormously powerful explosion that occurred near the Podkamennaya (Lower Stony) Tunguska River in what is now Krasnoyarsk Krai in Russia about 7:14 A.M. on June 30, 1908 (June 17 in the Julian calendar, in use locally at the time). The explosion is believed to have been caused by the air burst of a large meteoroid or comet fragment at an altitude of 5–10 kilometres above the Earth's surface. Different studies have yielded varying estimates of the object's size, with general agreement that it was a few tens of metres across."