SETI : the search for extraterrestrial intelligence
•Our only real hope of detecting ET (unless they come to us) is by listening to the radio
–Radio travels at the speed of light, over the whole Galaxy
–Radio is a low energy way to send a message
–We already have the ability
–             to send and receive across the Galaxy
•Where should we listen?
–Not the currently known extrasolar systems!
–Solar-type stars? Milky Way?
•How should we listen?
–Frequencies that are relatively quiet.
–How narrow-band?The “water hole”?
•What should we listen for?
–A regular carrier pattern. Complexity.
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•What are the odds we will hear
•something?
–The Drake equation
Orbital Chaos
70 Vir system