The story was originally podcast in SpaceTime with Stuart Gary Series 19 Episode 73
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How Pluto paints its largest moon red.
Pluto’s binary partner and largest moon Charon owes its unusual reddish
polar colouring to methane gas escaping Pluto’s atmosphere and becoming
trapped by Charon’s gravity -- eventually freezing on to its cold, icy
surface. The findings resolve a long standing mystery which began in
June 2015, when the cameras on NASA’s approaching New Horizons
spacecraft first spotted the strange reddish polar region on Charon.
