Tunguska. western Siberia

June 30, 1908

hundreds of square miles of forest

heard in London
5700 km away

orange glow in sky for days

read newspaper at night in Europe (?)

speculation it was a meteorite, exploded above surface. No material found.

Trees flattened for about 20 miles around. Trees standing at epicenter.

knocked over an estimated 80 million trees over 2,150 square kilometres (830 square miles). - wikipedia Likely meteorite 5-10 km above.