The Tunguska Event, or Tunguska explosion, was a powerful explosion that occurred near the Podkamennaya (lower Stony) Tunguska River in what is now Krasnoyarsk Krai of Russia, at around 7:14 a.m.[1] (0:14 Ut, 7:02 a.m. local solar time[2]) on June 30, 1908 (june 17...