re: Terrestrial Planet Finder
"SETI based upon the assumption of ET continuously beaming a high power signal at us is a silly waste of money. SETI will fail and leave people with the false conclusion that life is extremely rare in the galaxy. SETI has as much hope of success as using an Ouija board (an Ouija board is much cheaper)."
Perhaps that is the way it is done now (someone will answer that for me.)
But how large would a radio telescope have to be to detect radio or television type emissions from a planetary system say 10 ly away?
Bob Clark