for potential evidence of extraterrestrial technological equipment". See also a suggested mission involving a constellation of spacecraft to directly detect Earth-like planets – e.g. detectability to SETI programs by extraterrestrials Open SETI on the Allen Telescope Array potential SETI signal References Further reading Phillip Morrison, John Billingham, & John Wolfe: The search for extraterrestrial intelligence—SETI. NASA SP, Washington 1977 David W. Swift: Seti Pioneers: Scientists Talk about Their Search for Extraterrestrial Intelligence. Univ. of Arizona Press, Tucson 1993, Frank White: The Seti Factor: How the Search for Extraterrestrial Intelligence Is Changing Our View of the Universe and Ourselves. Walker & Company, New York 1990, External links SETI official website Harvard University SETI Program University of California, Berkeley SETI Program Project Dorothy, a Worldwide Joint SETI Observation to Commemorate the 50th Anniversary of Project OZMA The Rio Scale, a scale for rating SETI announcements 2012 Interview of SETI Pioneer Frank Drake by astronomer Andrew Fraknoi Astrobiology Distributed computing projects Radio astronomy Interstellar messages