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Why do Pluto "halos" have methane ice (purple) on walls & rims but water ice (blue) between? https://t.co/tX8qvKtdVg http://pic.twitter.com/02DqP2mHWl

— NASA New Horizons (@NASANewHorizons) April 21, 2016

via Twitter https://twitter.com/NASANewHorizons

April 21, 2016 at 07:25PM