Alien hunters: What if ET ever phones our home? (BBC UK)

For decades we've been sending signals - both deliberate and accidental - into space, and listening out for alien civilisations' broadcasts. But what is the plan if one day we were to hear something?

If we ever detect signs of intelligent alien life, the people likely to be on the receiving end of a cosmic signal are the scientists of Seti, aka Search for Extraterrestrial Intelligence.

This loose band of a couple of dozen researchers around the world doggedly listens to the cosmos in the hope of catching alien communications. It's often in the face of scant funding and even ridicule.

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