http://www.kqed.org/.stream/anon/radio/quest/2008/01/2008-01-18-quest.mp3
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.