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Across 3. the cause of the Earth's seasons 4. closest dwarf planet to the sun 8. the scientific principle that says share all procedures and data 9. A large ball of gas and plasma that produces light 12. a guess to a question of truth that cannot be tested 15. A huge cloud of gas and dust in space 17. A large, round object orbiting a star that does not dominate its orbit. 19. A natural object that orbits around a planet or dwarf planet 22. planet or dwarf planet that is furthes from the sun 25. smallest dwarf planet 27. the fourth planet from the sun 28. a measure of how much a circle has been flattened into an oval 30. a guess to a question of truth that can be tested 32. rules that govern a member of a specific profession 34. an organized, systematic attempt to understand the universe 36. smallest planet 37. number of planets in our solar system 38. A large, round object orbiting a star that dominates its orbit.

Down 1. dwarf planet with 3 moons 2. second planet from the sun 5. An old star, near the end of its life, that has grown larger and cooler 6. 1 of 3 possible fates of stars after they use up their fuel. 7. 1 of 3 possible fates of stars after they use up their fuel. 10. largest planet in solar system 11. number of known dwarf planets in our solar system 12. second largest planet 13. collection of billions of stars 14. an attempt to persuade people using faith and belief instead of evidence 16. the scientific principle that says do not commit fraud 18. largest known dwarf planet 20. Any object orbiting a star that is not a planet or dwarf planet 21. 1 of 3 possible fates of stars after they use up their fuel. 23. third largest planet 24. the path an object takes as it goes around the sun 26. closest planet to the sun 29. furthest planet from the sun 31. the accepted answer to a question of truth that has been fully tested 33. the scientific principle that says do not plagarize 35. fifth largest planet