PX282 - K1 - composition

image: lecture notes, P. Wheatly
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from the radius and mass, it has been found that jupiter and saturn are dominated by gas, hence called gas giants
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similarly, uranus and neptune have less gas
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they have higher proportions of common ices of volatile elemets: H
O, NH , CH -
hence, they are called ice giants
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they do have hydrogen and helium envelopes