The 1908 Tunguska Event, thought to have been caused by an asteroid about 50 meters in diameter, flattened 2,150 square kilometers of forest, an area equivalent to that of Tokyo.
Sources
- July 5: the day the world was due to end – Cosmos (cosmos.isas.jaxa.jp)
- https://www.nasa.gov/history/the-tunguska-event/ (nasa.gov)
- https://www.metro.tokyo.lg.jp/english/about/history/index.html (metro.tokyo.lg.jp)
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