However, the chances of extinction by natural events may be very low on the scale of a civilization's lifetime. Based on an analysis of impact craters on Earth and the Moon, the average interval between impacts large enough to cause global consequences (like the Chicxulub impact) is estimated to be around 100 million years.
However, the chances of extinction by natural events may be very low on the scale of a ci:vilization's lifetime. Based on an analysis of impa.ct craters on Earth and the Moon, the average interval between impacts large enough to cause global consequences (like t.he Chicxulub impact) is estimated to be around 100 million yea:rs.