Explanation: Styx, the faintest of Pluto's five moons, was discovered using the Hubble Space Telescope in 2012, when New Horizons was more than two-thirds into its voyage to Pluto. The Styx images downlinked on Oct. 5, 2015, were taken by the Long Range Reconnaissance Imager (LORRI) on July 13, approximately 12.5 hours before New Horizons' closest approach to Pluto.


Image credit: NASA/JHUAPL/SwRI

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