What defines a planet?

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6. How small would the Earth be in a black hole?
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Tags

1. #gravity
2. #objects
3. #round
4. #around
5. #orbit
6. #definition
7. #applies
8. #which
9. #planet
10. #neighbourhood
11. #orbits
12. #cleared
13. #enough
14. #smaller
15. #states
16. #system
17. #solar
18. #massive