The Torino Scale, which was created by Professor Richard P. Binzel, measures how likely it is that ‘near-Earth objects’ such as asteroids and comets will hit the Earth, and how serious the impact will be.
The scale runs from 0 to 10. A ‘0′ means the likelihood of a collision is zero, whilst a ‘10′ means a collision is certain, capable of causing global climatic catastrophe that may threaten the future of civilization as we know it, whether impacting land or oceans.
The highest level ever reached on the Torino Scale was ‘4′. This occurred in December 2004, when 99942 Apophis, an asteroid 270m away from Earth caused a brief concern, however it was later downgraded to 0. Phew!
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