The Architect
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Why isn't Eris considered a planet despite being the body of dominant mass?
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Because the "orbital neighbourhood" of Eris (and Ceres and Pluto) is defined as the entire Kuiper belt or in Ceres' case the entire Main belt in the planetary dominance discriminants user SpaceBread ...

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Why don't we have in-between planets?
-1 votes

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-...

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