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Pluto (color-enhanced) from New Horizons, Sept 24, 2015 release

Can Pluto’s Atmosphere Last Billions of Years?

Pluto's atmosphere is freezing onto the surface again as its orbit takes it farther from the sun. How many times has this happened?

Mars Is Losing Its Atmosphere Fast

Measurements of Martian atmospheric loss rates imply incredible changes over the assumed billions of years of Mars' history.
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