Space: Planet 9 — a hypothetical 9th planet in our solar syste…

Question

Did you know? Planet 9 — a hypothetical 9th planet in our solar system — was proposed in 2016 based on the strange orbits of Kuiper Belt objects. Astronomers think it is 5-10× larger than Earth and 600+ AU from the Sun (20× farther than Neptune). It has never been directly observed — pure mathematical prediction.

Accepted Answer

Planet 9 — a hypothetical 9th planet in our solar system — was proposed in 2016 based on the strange orbits of Kuiper Belt objects. Astronomers think it is 5-10× larger than Earth and 600+ AU from the Sun (20× farther than Neptune). It has never been directly observed — pure mathematical prediction.

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