Impact! by Professor Ian Morison

There is simple evidence that, even in recent times, the Earth has suffered major impacts from asteroids and comets. What dangers do they hold for our civilisation?

Major efforts now being made to detect those that might harm us and strategies are being developed to prevent their impacts. But we do have a problem with comets…

From: http://www.gresham.ac.uk/event.asp?PageId=108&EventId=971

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