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NASA's Unexplained Files Season 4 Episodes
Season 4 Episode Guide
Episode 1 - Pluto's Stranger ThingsAstronomers find evidence for alien technology around a distant star. Then, pictures of Pluto show that something might be moving across its surface, and Apollo astronauts see something inexplicable as they approach the moon. |
Episode 2 - Rise of the Planet KillerA mission to Mars captures an image of a strange structure. Then, the first Apollo mission records an eerie sighting on the dark side of the moon, and a planet-eating star gives scientists a glimpse of Earth's terrible demise. |
Episode 3 - A President's Close EncounterGeysers are discovered on a frozen moon, and NASA redirects a probe on a mission to detect evidence of life. Then, an unidentified object is spotted approaching a near-earth asteroid, and a future president witnesses a UFO. |
Episode 4 - The Earth Next DoorAstronomers detect a potentially habitable planet close to Earth. Then, a discovery at NASA reveals a top-secret military space program, and missions bring back evidence that the moon could have the building blocks for life. |
Episode 5 - Curse of the Full MoonA near collision in space forces two cosmonauts to abort their mission. But a disastrous re-entry leaves them dying in a frozen lake. |
Episode 6 - Did Earth Have Two Moons?Scientists investigate an ancient sighting by Roman soldiers which points to the earth having two moons. |
Episode 7 - Mystery of the Invisible PlanetAstronomers studying a distant solar system discover something extraordinary: evidence of an invisible planet orbiting a star. |
Episode 8 - Mars's Deepest SecretThe Mars Reconnaissance Orbiter captures an image of bizarre streaks on the Martian surface. |
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