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Spring 2008  Astr 10  5/14  Lecture 4.7  
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"Sometimes I think we're alone [in the universe], 
and sometimes I think we're not.  In either case 
the idea is quite staggering."
--Arthur C. Clarke

TODAY: ARE WE ALONE?
Quiz 12: 6:30-6:45 PM
     **NO CELL PHONES/MEDIA PLAYERS/PDAS ALLOWED**
     USE YOUR OWN UNIQUE 4-DIGIT P.I.N.
The Drake equation
Criticisms and limitations
"BETI"
     _Mission to Mars_ Binary counter
     (Touchstone Pictures, 2004)
     Arecibo message
     Anti-coded messages (*.pdf)

NEXT TIME
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