Assertion: terrestrial planet's core | /r/LocatedNear | enormous atmosphere of gas
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Source sentences:
text: Although many popular sources claim they are entirely made up of gas, this is not entirely accurate: Jovian planets have a solid rocky core which is probably roughly the size of a terrestrial planet, surrounded by an enormous atmosphere of gas collected during planetary formation from the clouds of hydrogen and helium floating through the primordial solar nebula.