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How did it get so far away?
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Is There a Hidden Massive Planet in Our Solar System?
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- 1 Why planet 9?
- 2 How did we determine that Planet 9 may exist?
- 3 Why haven't we seen Planet 9?
- 4 Evidence for Planet 9
- 5 How far away is Planet 9 on human scales?
- 6 How did it get so far away?
- 7 What would planet 9 look like?
- 8 Is it hiding where we can't see it?
- 9 Further Study: A Field guide to the planets