Allen Tough argues that if extraterrestrial intelligent life exists in the universe then it will have sent probes out to look for life (similar to Voyage or the the Spirit rover). Seth Shostak looks at his argument and whether or not scientists should be looking for extraterrestrial probes.
Walter Simmons, a physicist at the University of Hawaii, together with his colleague, Professor Sandip Pakvasa, have come up with a clever scheme that would allow interstellar broadcasters to keep the coordinates of their home planet secret by taking advantage of advances in quantum cryptography.
A growing number of SETI researchers are looking for flashing lights in the sky, or optical SETI, to detect extraterrestrial intelligence.
Seth Shostak writes on the societal implications of the Search for Extraterrestrial Intelligence.
Seth Shostak explains why any extraterrestrials we come into contact with will almost certainly be more technologically advanced than we are.