Where does the surface of a gaseous planet end? And where does your start atmos

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Where does the surface of a gaseous planet end? And where does your start atmosphere ? The gaseous planets are composed mainly of hydrogen and helium . Their atmospheres are considered to be at a depth at which atmospheric pressure is equal to normal Earth pressure. At that limit there is no solid or at least liquid surface . As you go deeper into planet , The pressure increases and , when it reaches 12 atmospheres , hydrogen becomes a supercritical liquid , so the difference between a gas and a liquid simply disappears . that is to say, below the gas layers is an ocean of conditionally liquid hydrogen and helium : between this ocean and the gas layer there is no clear border , It extends over many kilometers of smooth transition.,..

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