Are we alone?

Donald Trump promised to release classified files about extraterrestrials. But even if they disappoint the millions of people hoping to find proof of existence of aliens, there is a growing belief in the scientific community that it is only a matter of time before proof of life outside our solar system is found.

Reporter: Giles Whittell

Producer: Matt Russell

Sound design: Dominic Delargy

Artwork: Lola Williams

Editor: Jasper Corbett

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