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June 2, 2018 07:00 am
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/WHSMjLPWBPQ/is-pluto-actually-a-mash-up-of-a-billion-comets
Is Pluto Actually a Mash-Up of a Billion Comets?
Scientists from the Southwest Research Institute suggest Pluto may be a comet, as opposed to a planet or dwarf planet. According to a study published in the journal Icarus, Pluto could be made up of billions of comets all mashed together. Smithsonian reports: Scientists had long believed the dwarf planet Pluto was formed the way planets come to be: they start as swirling dust that's gradually pulled together by gravity. But with the realization that Pluto was a Kuiper belt dwarf planet, researchers began speculating about the origins of the icy world. The researchers turned to Sputnik Planitia -- the western lobe of the massive heart-shaped icy expanse stamped on Pluto's side -- for the task. As Christopher Glein, lead author of the paper and researcher at the Southwest Research Institute, explains to [Popular Science editor Neel V. Patel], the researchers used the data from New Horizons on this icy expanse to estimate the amount of nitrogen on Pluto and the amount that's escaped from its atmosphere. Glein explains the conclusions in a statement: "We found an intriguing consistency between the estimated amount of nitrogen inside the [Sputnik Planitia] glacier and the amount that would be expected if Pluto was formed by the agglomeration of roughly a billion comets or other Kuiper Belt objects similar in chemical composition to 67P, the comet explored by Rosetta." The report goes on to mention a few caveats. "For one, researchers aren't sure that comet 67P has an average comet composition," reports Smithsonian. "For another, New Horizons only captured information about Pluto at a specific point in time, which means nitrogen rates could have changed over the last billions of years. [T]here's also still the possibility Pluto formed from cold ices with a chemical composition to that of the sun."Read more of this story at Slashdot.
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/WHSMjLPWBPQ/is-pluto-actually-a-mash-up-of-a-billion-comets
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