=====
Fall 2007  Astr 10  12/11  Lecture 4.7  
=====
"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: 1:00-1:15 PM
     **PLEASE SIT IN EVERY OTHER SEAT**
     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
"Quiz 13" Announcements
     POST-TESTS FOR EDUCATIONAL RESEARCH
     Credit given for filling out these surveys