Since Kulik's first expedition in 1927, there have been numerous Russian and international scientific expeditions to the Tunguska explosion site, but no impact craters or substantial meteorite remnants have yet been found. Besides a flattened forest, did the fireball leave other fingerprints?
Those who believe that the Tunguska object was either a comet or an asteroid also believe that the mass of the object vaporised into microscopic debris when it exploded at some height above the ground. Such a theory would also account for the absence of any impact craters. After the explosion, some of the microscopic debris drifted westward from Tunguska, but the rest condensed into microscopic globules that rained on to the Tun-guska taiga. Many scientists have tried to interpret these fingerprints.
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