ARECIBO, Puerto Rico (AP) - For several weeks a year, Peter Backus sits in a building in the middle of the forest, staring at the digital representation of nothingness on two 19-inch monitors. It's a thankless, Sisyphean task, but worth it: the monitors are attached to the Arecibo Observatory, the largest one-dish radio telescope on earth, and the day they show a clear and  meaningful signal from another world could be the day Backus and his colleagues earn their place in the history of the cosmos. It's been 15 years - on and off - without a significant peep, but Backus takes the situation in stride.

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