When Pluto's fifth moon, P5, was discovered last year, NASA officials in charge of the New Horizons mission to explore the far-off dwarf planet were forced to re-plan their course. But when scientists ran simulations to learn more about the five moons, they discovered evidence of at least 10 tiny uncharted moons, creating more complications for the 2015 mission. Scientists say they wouldn't be able to spot any of the possible moons from Earth, so are instead working to discover how they came to orbit the dwarf planet and gain a better understanding of what exactly they are.

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