If aliens are sending us signals, are we set up to detect them? Dan Riskin speaks with planetary scientists, radio astronomers, and computer scientists who explain how the search for ET has ramped up in the last few decades. But if they're successful, is there a way to predict what alien creatures might look like?

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W5 is Canada’s most-watched investigative, current affairs and documentary program. Tackling major stories and investigations W5 is in its 51st season.