Hank tells us about NASA’s Near-Earth Object Program, which tracks the paths of asteroids and categorizes them according to the likelihood that they will strike the Earth at some point in the future.
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References:
http://www.jpl.nasa.gov/news/news.cfm?release=2012-051
http://blogs.discovermagazine.com/badastronomy/2012/03/06/asteroid-2011-…
http://neo.jpl.nasa.gov/1950da/
http://neo.jpl.nasa.gov/1950da/1950da.pdf
