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The danger of an asteroid impact on the Earth's surface is one that has been largely ignored until fairly recently. Although impacts severe enough to be a threat to human life are fairly rare (on the order of one per century), larger impacts posing a threat to millions of lives or even to all life on Earth are inevitable over the long term.
- Deadly asteroid impact denial: a satirical thought-game
- 2014/05/02 [L..T] NASA seeks help to save Earth from killer asteroids "After a previously undetected, 65-foot-wide asteroid exploded over Russia in February 2013, unleashing the force of 500,000 tons of TNT, NASA launched a series of contests for smart folks around the globe to come up with ways to keep an eye on asteroids that could threaten Earth."
- 2014/04/22 [L..T] Asteroids as powerful as NUCLEAR BOMBS strike Earth TWICE YEARLY "A study using data from monitoring stations designed to enforce a nuclear test ban treaty shows that the Earth is enduring far more dangerous asteroid impacts than previously thought."