Spectra of Pluto's Icy Moons

Explanation: A comparison of the compositional spectra of Pluto's moons Charon, Nix and Hydra to pure water ice. Nix's surface displays the deepest water-ice bands seen among Pluto's three satellites — Charon, Nix and Hydra — for which New Horizons obtained surface spectra.

Pluto

Image credit: NASA/JHUAPL/SwRI