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Watch NASA's Unexplained Files OnlineWatch NASA's Unexplained Files Online
NASA's Unexplained Files
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Watch NASA's Unexplained Files

S1-3 Box Set available until 17 Oct 2017S3 episodes 1-16 Live and Catch Up available until 17 Oct 2017
3 Seasons30 EpisodesDocumentaries
Geologists discover alien deposits on the Earth's surface - and the answer could shed light on the cause of the greatest extinction in its history.

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Episode 1
Season 1 Episode 1Episode 144 mins
In 2005, NASA astronaut Leroy Chiao's spacewalk was interrupted by bright lights flying past. Is there a logical explanation or was there really something strange out there?
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  • Episode 6

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