Efforts to detect alien technological signatures previously have focused on a narrowband radio signal type concentrated in a limited frequency range or on single unusual transmissions. The search involves a frequency range covering a bit less than a tenth the width of an average FM radio station. "Aliens may possibly use such beacons for galaxy-wide communications, for which the core of the Milky Way is ideally placed. The scientists in the various monitoring efforts passively scan for signals of alien beings and do not actively send their own signals advertising our presence on Earth. "In my personal opinion, as a relatively young species in the grand cosmic scale, it would be prudent for us to focus on listening and investigating before embarking on deliberate transmissions," Gajjar said.

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Persons: Akshay Suresh, Suresh, Vishal Gajjar, Gajjar, BLIPSS, Will Dunham, Rosalba O'Brien Organizations: Cornell University, Cornell, SETI Institute, SETI Institute and University of California, Thomson Locations: Berkeley, West Virginia