An asteroid which may be as big as a ten-storey building has passed close by the Earth, astronomers say
Missed by just 72,000 km (44,750 miles); a fifth of the distance between our planet and the Moon , and only twice the altitude of satellites in geosynchronous orbit.
Asteroids of this size crashing down on the Earth could potentially unleash a destructive power equivalent to about 10 to 15 megatonnes of TNT. This is about 1,000 times more powerful than the blast from the bomb dropped on Hiroshima.
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