So the basic idea is that the earth is like an egg with only gas to fill inside? Well what if the inside isn't hollow like with gas but filled with liquid? Not much farther than what think already but maybe matter at a great enough pressure acts more like liquid. That the only solid portion of earth is its shell, the crust. That could extend for hundreds of miles. But beneath this is nothing but highly pressurized matter that is liquified. This at least makes more sense to me than a gas interior.
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