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What Are We Looking For?

When scientists look for extraterrestrial life, what exactly are they looking for? Or listening for? Signals in the noise; anything that doesn’t match the pattern of nature; technology, basically. But how? From radio wave signals to time compression, the director of the SETI Institute, Jill Tarter, breaks down the tools of trade in the scientific search for life beyond. Watch the full program: The Search for Life in the Universe.