Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org

Today's 2 topics:

- Over geologic times, the impacts of objects from space have produced significant changes to our planet's biosphere. Earth threatening asteroids present a complicated challenge due to the wide range of compositions, sizes, orbital paths, and warning times that we can encounter.

- Have you wondered what would happen if a rock from space landed near one of our large cities? We got a clue on February 15, 2013 when a large fireball appeared in the sky over Russia.

 

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