Which planet in the solar system is least dense? jupiter mercury neptune saturn < - answer

mercury

explanation:

mercury is the least dense because of its size

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radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.