On 30 June 1908 a huge fireball exploded in the sky above the Tunguska river in Siberia. Being a wilderness, no human life was lost, but a blinding flash was witnessed as far away as Britain.
Until 1927 no one went to the area, when mineralogist Leonid Kulik found an area of 770 sq miles of total devastation, with an estimated 70 million trees flattened as if a fan. No debris or crater was found. In 1930, meteorologist Francis Whipple suggested it was caused by a small comet exploding in the air, though others argue it was a huge asteroid that broke up before impact.
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