NASA's Unexplained Files

NASA's Unexplained Files· Season 2 · Episode 1

Life in Hell

S02E01·March 2, 2015·1h·Science

A UFO crashes in Pennsylvania. Was it a secret Soviet satellite or something far more dangerous? On Mercury, NASA finds the impossible: frozen water. A strange object causes a skyscraper-sized shadow on the surface of Mars's largest moon. What is it?

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