One year ago today, the New Horizons spacecraft made its closest approach to Pluto and its moon Charon. Since then, NASA scientists have made numerous discoveries about the now-dwarf planet, such as craters, mountains and seas of solid nitrogen.
Last month, scientists discovered super-grand canyon on Charon that makes Arizona's Grand Canyon look like a scratch!
http://www.nasa.gov/feature/a-super-grand-canyon-on-pluto-s-moon-charon
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