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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