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Pluto is on the brink of being wiped off the solar system map. In a tragic end to a short life, the smallest and youngest planet could be relegated to the status of a mere asteroid. Scientists have mocked Pluto for years and the discovery of a potential tenth planet in our backyard could be the final nail in its coffin. As the International Astronomical Union tries to make up its mind, the film asks just how many planets there are in our solar system.