Almost as soon as a meteor burned up in the sky above Russia today, firsthand accounts appeared on the Internet, complete with dashcam videos and photos of the meteor's train. But in 1908, when an asteroid or comet fragment exploded about five miles above the earth's surface, destroying 800 square miles of boreal forest in central Siberia and uprooting 80 million trees, the area was so isolated that it took decades for eyewitness reports to emerge.
Leonid Kulik, a Russian mineralogist who was the first scientist to investigate the incident, traveled into the forest by raft to gather evidence in 1927. Kulik reported on his trip in the Journal of the Russian Academy of Science, and included excerpts from eyewitness accounts. The translations below were published in 1935 in Popular Astronomy, and reprinted in a 1962 article in the Journal of the Royal Astronomical Society of Canada.
S.B. Semenov, a peasant who had been living about forty miles from the site of impact, wrote Kulik a letter to report his experience:
It was 1908 in the month of June about 8 o'clock in the morning; I...was occupied with work around my hut. I sat on the open porch with my face toward the north and at that time there arose, in a moment, a conflagration which gave off such heat that it was impossible to remain sitting—it almost burned the shirt off me...But to make up for that, this conflagration endured only a very short time; I had time only to cast my eyes in that direction and see how large it was, when in a moment it vanished...After this vanishing it grew dark, and at the same time there was an explosion which threw me off the open porch about seven feet or more
A Tungus (a local indigenous group) man named Luchetkan told Kulik that his relative had used the area of the blast to pasture his reindeer. This relative was wealthy; he not only owned more than 1500 reindeer, but also “had in his region many sheds in which he kept clothes, utensils, reindeer equipment, etc.” After the event, the two men went to look for the beasts. Kulik writes:
Of some reindeer they found the charred carcasses; the others they did not find at all. Of the sheds nothing remained; everything was burned up and melted to pieces—clothes, utensils, reindeer equipment, dishes, and samovars...
Perhaps because it occurred in such isolation, the Tunguska Event has inspired many theories about its provenance: a black hole fell through the earth; a chunk of antimatter landed in Siberia; one of Nikola Tesla's experiments went horribly wrong. Scientists still debate whether the body which burned up above the taiga was a fragment of a comet or an asteroid. But they are sure it was one of the two.
Scientists at the University of Bologna who have been researching this event for years host a site full of photographs and scientific publications. An informal group of researchers maintains an extensive archive of primary documents, in Russian, related to the Tunguska strike.