Fri, Jan 18, 2008 -- 8:33 AM

An Asteroid's Close Call
This has been a month of dashed hopes for astronomers around the world. Last month it seemed possible that an asteroid the size of a Boeing 737 jet was due to collide with Mars on January 30. Today that seems far less likely, but, as Amy Standen reports, astronomers consider it a wake up call.

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Host: Andrea Kissack