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Currently you are able to watch "NASA's Unexplained Files - Season 4" streaming on ThreeNow for free with ads.
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.