Charon and the Small Moons of Pluto . ... Credit Copyright: NASA , Johns Hopkins U. APL , SwRI Explanation: What do the moons of Pluto look like? Before a decade ago, only the largest moon Charon was known, but never imaged. ... Finally, this past summer, New Horizons swept right past Pluto , photographed Pluto and Charon in detail, and took the best images of Styx, Nix, Kerberos , and Hydra that it could. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...