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Styx from New Horizons Styx is Pluto's innermost small moon, and one of the last discovered (along with Kerberos). New Horizons took this photo from a distance of 631,000 kilometers, 12.5 hours out from Pluto closest approach. The image does not reveal any details but shows that Styx is very small indeed: in this image it appears about 5 by 7 kilometers in size. NASA / JHUAPL / SwRI