Figure 36.36 Pluto and Charon.

This is the clearest view yet of the distant planet Pluto and its moon, Charon, as revealed by NASA's Hubble Space Telescope (HST). The Hubble observations show that Charon is bluer than Pluto. This means that the worlds have different surface composition and structure. A bright highlight on Pluto suggests that it has a smoothly reflecting surface layer. (Dr. R. Albrecht, ESA/ESO Space Telescope European Coordinating Facility; NASA)

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