THE Tunguska blast that flattened a huge swathe of remote Siberian forest one morning in 1908 might have come from within the Earth rather than from outer space.
Although the mysterious explosion didn’t leave a crater, trees over an area of 2100 square kilometres were burnt and flattened. Most researchers agree that the devastating incident was caused by some kind of celestial body disintegrating a few kilometres above the ground,and say the only serious debate about Tunguska is now whetherit was a fragment of a comet or a stony meteorite.
Yet scientists are still arguing over certain unexplained events…
