Some recent encounters with asteroids

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1908

A 60-metre asteroid exploded in the air about 8 kilometres above the Tunguska region of Siberia,destroying hundreds of square kilometres of forest. The explosion was equivalent to 20 hydrogen bombs.

1978

A huge explosion equivalent to 100,000 tons of TNT was detected in the South Pacific. This was first thought to be a secret nuclear test,but most experts now think it was an asteroid strike.

1991

An asteroid 10 metres in diameter passed between the Earth and the Moon scoring a near miss.

1992 

An asteroid called Toutatis measuring 3 km across passed within 3 million km of Earth. Toutatis is a regular visitor and in 2004 it is expected to come closer within 1.5 million km of Earth.

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