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There is a few things one has to consider when talking composition: It is usual to talk about relative abundances, and usually the solar composition is taken as the measure for this in the assumption that its composition is mostly prestine with a few exceptions. Now you can compare observations of different bodies and look at ratios of different materials, ...


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Since 2016 a ninth planet is hypothesized beyond the Kuiper belt which, if it exists and if it's a planet, is either a super-Earth or a mini-Neptune. But you might want to consider Venus a planet in-between. While it isn't bigger than Earth, on the surface of Venus the air pressure is almost a hundred times that on Earth which makes the atmosphere a ...


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