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NASA's Unexplained Files

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In more than half a century of space exploration, NASA has captured images of some of the most extraordinary things in the universe. Desolate planets, giant solar flares and distant nebula, but, they have also captured remarkable images closer to home; including objects which seem to defy explanation, flying just outside the Earth's atmosphere. Senior NASA astronauts remain disturbed by the phenomenon they've seen. Can these sightings be explained? Is there now evidence of advanced extraterrestrial life? This one-off special reveals NASA's top ten unexplained encounters using original footage and groundbreaking interviews with astronauts and scientists.