Moscow : A Russian researcher has claimed to have discovered fragments of the largest celestial body to hit the Earth in recorded history - in 1908 -though he has waited for 23 years before going public with the findings.
Three stones found by Andrei Zlobin of the Vernadsky State Geological Museum at the Russian Academy of Sciences in central Siberia may have been part of the so-called Tunguska meteorite that exploded over the area in 1908, he said in a report on Arxiv.org.
Though the Tunguska blast was 1,000 times more powerful than the nuclear bomb that destroyed Hiroshima in 1945, scientists have failed to find any fragments of the celestial body that caused it.
A popular theory puts the Tunguska event down to an ice asteroid or comet that exploded in the atmosphere and evaporated without a trace.
But Zlobin said that he found several fragments of the Tunguska bolide during a 1988 expedition to the area where the event took place.
Three stone bodies found on the shoal of the Khushmo river near the impact site have traces of melting and regmaglypts, or indentations formed during a meteorite's passing through the atmosphere, he said.
The samples, which are still pending a chemical analysis, were mothballed until 2008, Zlobin said, without elaborating on the reasons.
Russian academia suffered a dramatic decline after the Soviet Union's demise in 1991 due to lack of funding.
Even if their link to the Tunguska event is confirmed, the samples would not necessarily disprove the ice comet theory because the comet's nucleus could have contained small stone bodies, the study said.
It added that calculations show the Tunguska object had density comparable to that of the nucleus of Halley's Comet, made up of ice and dust.