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In 1960, a radio telescope was pointed out into space to listen for signs of extra-terrestrial intelligence, trying to add scientific fact to the question "is anybody out there? But 50 years on, nobody knows the answer to it.
"It's probably the most important question there is," says Dr Frank Drake, who was a pioneer of radio astronomy and is considered the father of Seti - the Search for Extra Terrestrial Intelligence.
"What does it mean to be a human being? What is our future? Are there other creatures like us? What have they become? What can evolution produce? How far can it go?