For decades, planetary scientists assumed that Pluto was unlikely to have oceans. Since the surface temperature is around -220°C, it is so cold that gases such as nitrogen and methane freeze and turn into ice. So you can cut off the water. But a few years ago several famous scientists have collected evidence suggesting that Pluto likely has an ocean of liquid water beneath its icy surface. The guess is based on several pieces of evidence. Including supercooling (cold volcanism) several volcanoes on Pluto that release ice and steam
Exploring the dwarf planet's oceans can be difficult. But recently, Earth, environmental and planetary scientists from the University of Washington, St. Louis, US said they used mathematical models and images from the New Horizons spacecraft that flew by Pluto in 2015 to take a closer look at Pluto's oceans. Cracks and bulges in the ice covering Pluto's Sputnik Platina basin have been discovered to be areas struck by a meteorite billions of years ago. There is an ocean in this region beneath an ice crust 40-80 kilometers thick, a shield that may prevent the ocean from freezing.
It is also estimated that Pluto's ocean is about 8% denser or saltier than most seawater on Earth, or very similar to the Great Salt Lake in Utah, USA, so if we fell into Pluto's ocean, Pluto would likely have lost most of its heat. Shortly after its formation. Preliminary calculations indicate that it has hardened to its core.
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