Why Is Our Solar System Missing The Universe's Most Common Planet?

Jupiter, Saturn, Neptune and Uranus are fearsome, towering planets, but then there
Jupiter, Saturn, Neptune and Uranus are fearsome, towering planets, but then there's nothing until we get down to Earth-sized worlds. Where's everything in between?

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Why Is Our Solar System Missing The Universe's Most Common Planet?

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Why Is Our Solar System Missing The Universe's Most Common Planet?

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Planet 9, Ninth Planet Name