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Politics : The Castle -- Ignore unavailable to you. Want to Upgrade?

To: Lane3 who wrote (4189)	11/23/2004 8:30:27 PM
From: TimF	Read Replies (1) \| Respond to of 7936

One in 10 million per year would mean 1 in 100,000 per century, or per a long human life time. The one in 100mill per year (or 1 in a million for a long life) chance of an asteroid wipeing out human life is slim but I think its worth taking measures against it as long as the measures are not to expensive, esp since such efforts would also protect against more likely lesser disasters such as an impact large enough to destroy a city. Estimates of an impact of that size would happen on the average between more than once per century to once per thousand years according to different estimates (part of the variation is what level of power counts as city destroying). Those are estimates for an impact anywhere on the earth not directly on to a city, but as the earth gets more populated the chance of people dieing from such an impact increases. There is some reason to think that thousands of Chinese may have been killed by multiple impacts (from a broken up comet or asteroid) in 1490. europhysicsnews.com msnbc.msn.com spaceflightnow.com