Scientists say that on average every 100 million years the earth gets hit with an asteroid big enough to change the weather and to cause mass extinctions. The last asteroid that did that to the earth was 65 million years ago. But it is not like someone is out there with a grandfather clock, and precisely every 100 million years they send a devastating asteroid at the earth. We can track some asteroids, just not well enough to make a solid prediction of when a big one would hit the earth. We could get hit by an asteroid next year. A lot of scientists want us to build self sufficient colonies on other places than earth in the solar system, because there are too many ways life can be destroyed on earth. It will probably take us a while to be able to do that.
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