On a chilly morning last week, Jill Tarter sat in a makeshift corner office facing the Allen Telescope Array, pondering a set of parallel lines that striped a window in her MacBook.

Dr. Tarter directs the Center for SETI ResearchSETI is the search for extraterrestrial intelligence — and the 42 antennas that sit outside her window are once again sampling radio emissions from a patch of sky that offers a window into one of the spiral arms of our galaxy. Shuttered for more than a year by budget problems, the array was turned back on in December to continue its search. Now, the searchers have another reason for optimism.

With new Web-based software called SETILive, an army of independent citizen-scientists are being enlisted to help with the hunt for unusual signals. The software, which can be found at setilive.org, was designed by Zooniverse, a team of programmers and scientists who have created Web-based systems to enable citizen participation in research in fields like astronomy and marine biology. SETILive was switched on late last month.

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