Water Ice on Hydra

Explanation: This compositional data (infrared spectra) was gathered with the Ralph/Linear Etalon Imaging Spectral Array (LEISA) instrument on July 14, 2015, from a distance of 150,000 miles (240,000 kilometers). It shows the unmistakable signature of crystalline water ice: a broad absorption from 1.50 to 1.60 microns and a narrower water-ice spectral feature at 1.65 microns.

Pluto

Image credit: NASA/JHUAPL/SwRI