Using pictures taken by the Hubble Space Telescope from 2002 to 2003, NASA has constructed new color images of Pluto (which, as you probably know, is no longer considered a planet: it is a plutoid, or dwarf planet). Pluto appears white, orange, and black, but scientists have noted that the dwarf planet is growing redder in color and its northern hemisphere is growing in brightness. This means that the planet is undergoing seasonal changes, just like we experience on Earth (seasons are dependent on the tilt of a planet; that is, a planet with no tilt has no seasons). NASA will be able to learn even more about Pluto when the New Horizons spacecraft passes by in 2015.
More from NASA.
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