Measurements of an argon isotope could help scientists understand whether the interiors of Uranus and Neptune, our solar system's so-called ice giants, are dominated by ice or rock. New research led by Southwest Research Institute (SwRI) and published in The Planetary Science Journal measured the planets' atmospheric argon-40 to estimate the amount of rock found beneath their surfaces and search for clues about the planets' origins, including where and how they formed.
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