Alan Stern Quotes
Liquids may have existed on the surface of Pluto in the past.
Citations
Stern, Alan. "The Pluto System After New Horizons." Annual Review of Astronomy and Astrophysics, vol. 56, 2018.
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NASA has now sent probes to every planet and dwarf planet. It took less than a century.
Sol Alan Stern is an American engineer and planetary scientist. He is the principal investigator of the New Horizons mission to Pluto and the Chief Scientist at Moon Express.