According to the Wikipedia article about the Torino Scale, a collision from an asteroid or comet with a rating of 10--large enough to cause global catastrophe and threaten civilization--could happen as much as once in 100,000 years. This means that if you live to be 80 years old, the chances of a world-trashing rock from space hitting the Earth during your lifetime could be as much as 1 out of 1250.
By way of comparison, your chances of winning the Mega Millions jackpot are 1 out of 176,000,000. I just felt like pointing that out.
By way of comparison, your chances of winning the Mega Millions jackpot are 1 out of 176,000,000. I just felt like pointing that out.