Pluto's Surface Spectrum

Explanation: Pluto's surface spectrum obtained with the SpeX spectrograph at NASA's InfraRed Telescope Facility (IRTF). Signatures of frozen carbon monoxide (CO), methane, (CH4), and nitrogen (N2) ices are clearly revealed.

Pluto

Image credit: W. M. Grundy, C. B. Olkin, L. A. Young, M. W. Buie, E. F. Young.