Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984s%26t....67...18c&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 67, Jan. 1984, p. 18-21.
Other
2
Meteoroids, Siberia, Tungusk Meteorite, Explosions, Earth, Tunguska Event, Impacts, Meteors, Explosions, Photographs, Popular, History, Hypotheses, Samples, Terrestrial, Comets, Orbits, Review, Analysis, Asteroids, Meteorites
Scientific paper
The data base regarding the Tunguska event of June 30, 1908 is reviewed, with emphasis laid on a theory that the object that exploded was a rocky body, and not a cometary fragment. Although eyewitness reports have been available for the event, the accounts conflict in particulars. The object's path has been reconstructed, and is cited as evidence that the origin was not a comet. Samples taken from the ground around the blast site contain large amounts of nickel, indicating a meteoritic parent body. Specimens gathered in Antarctic ice that formed at the time of the Tunguska fireball are also enriched in irridium, thereby suggesting that the object weighed several million tons. Calculations of the frequency of such large encounters predict a 12-40 percent chance that there will be another event of Tunguska-sized proportions within the next 75 years.
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