Scientists have identified a possible crater left by the biggest space impact in modern times - the Tunguska event. The blast levelled more than 2,000 sq km of forest near the Tunguska River in Siberia on 30 June 1908. A comet or asteroid is thought to have exploded in the Earth's atmosphere with a force equal to 1,000 Hiroshima bombs. Now, a team says a lake near the epicentre of the blast may be occupying a crater hollowed out by a chunk of rock that hit the ground.
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