Earth almost put on asteroid impact alert
Astronomers have revealed how they came within minutes of alerting the world to a potential asteroid strike last month, which had the potentially to have resulkted in a higher death toll than the 11 September attacks on New York's World Trade Centre.
Some scientists believed on 13 January that a 500m-wide object, later designated 2004 AS1, had a one-in-four chance of hitting the planet within 36 hours.
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