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Currently you are able to watch "NASA's Unexplained Files - Season 4" streaming on Discovery+, Discovery+ Amazon Channel.
There are no options to watch NASA's Unexplained Files for free online today in India. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
Astronomers find evidence for incredible alien technology around a distant star, Apollo astronauts see something they can't explain as they approach the moon, and a planet-eating star gives scientists a glimpse of Earth's terrible demise. Explore these and many other mysteries on this season of NASA's Unexplained Files.