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Published online 14 November 2003 | Nature | doi:10.1038/news031110-14
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Earth's asteroid risk reduced
Warmth of nearby space rocks gives clue to their size.
A new survey revises down the likelihood of a massive asteroid hitting the Earth by 20-30%. We're only due to collide with rocks larger than one kilometre across roughly once every 600,000 years, it concludes1.
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