Rice expert says a mitigation strategy is still a good idea
Two incidents involving asteroids on the same day has focused the world’s attention on objects which fall from the sky. The good thing is – the big ones don’t fall very often.
NASA scientists gave testimony to a U.S. House subcommittee yesterday about the likelihood of a meteor 140 meters across – called a “city killer” hitting the earth. They also discussed a mitigation strategy.
Rice University professor of Astronomy Christopher Johns-Krull says thousands of small objects hit the Earth’s atmosphere every day. “You eventually get to things as large as a few kilometers in size, which lead to mass extinction, but those are exceedingly rare.”
Johns-Krull says a 140-meter chunk of rock can be expected to hit the Earth maybe once every 50,000 years.