Asteroid collision 'less likely'

Refined calculations of the asteroid Apophis's path show it is far less likely smash into Earth in 2036 than was previously thought.

Earlier calculations put the probability of a collision at one in 45,000; the revised estimate puts the odds at one in 250,000.

Researchers from the US space agency Nasa showed that in 2029, Apophis will pass within just 30,000km of Earth.

The work will be presented at a meeting of the American Astronomical Society.

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