It would be the end of the world as we know it. A relatively small lump of rock – a small asteroid, perhaps only a few hundred metres across – plunging to Earth would devastate a continent or trigger tsunamis. Civilisation would be set back several centuries. It is a real risk, say a group of astronauts and astronomers who are to highlight the threat facing humanity by marking 30 June as Asteroid Day. The chosen date marks the anniversary of the “Tunguska event”, when a small asteroid or comet exploded above Siberia with the force of 1,000 atomic bombs. The largest impact event on Earth in recorded history, it occurred on 30 June 1908. Asteroid Day tries to save life as we know it http://www.theguardian.com/science/2015/jun/13/asteroid-day-anniversary-tunguska-siberia
http://www.theguardian.com/science/2015/jun/13/asteroid-day-anniversary-tunguska-siberia Asteroid Day tries to save life as we know it http://www.theguardian.com/science/2015/jun/13/asteroid-day-anniversary-tunguska-siberia Scientists and astronauts launch appeal for infra-red telescope to detect objects that could bring catastrophe to Earth View on www.theguardian.com http://www.theguardian.com/science/2015/jun/13/asteroid-day-anniversary-tunguska-siberia Preview by Yahoo
