At 7:17 am on June 30, 1908, a shocking explosion occurred at 60°54′11″ north latitude and 101°54′35″ east longitude in Siberia, Russia. Because the Tunguska River flows near the big explosion, it is called the “Tunguska Big Bang”. At that time, residents in the mountainous area northwest of Lake Baikal saw a blue light almost as bright as the sun streaking across the sky. At the horizon where the blue light disappeared, there were billowing clouds of smoke and pillars of fire reaching into the sky. About 10 minutes later, residents heard what sounded like artillery fire. Witnesses said the sound of the explosion moved from east to north, followed…