The New Horizons spacecraft observed Jupiter's icy satellites Europa and Ganymede during its flyby in February and Mlarch 2007 at visible and infrared wavelengths. Infrared spectral images map H_2O ice absorption and hydrated contaminants, bolstering the case for an exogenous source of Europa's "non-ice" surface material and filling large gaps in compositional maps of Ganymede's Jupiter-facing hemisphere. Visual wavelength images of Europa extend knowledge of its global pattern of arcuate troughs and show that its surface scatters light more isotropically than other icy satellites.
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