Across
- 2. A system of millions or billions of stars.
- 5. The name for the four inner planets
- 6. This is the largest planet
- 10. The Planet that we live on
- 14. Mars has these that are extinct
- 16. Mercury doesn't have this
- 18. This planet is red.
- 19. This is the hottest planet
- 22. Study of the moon,stars, and other objects.
- 23. Mercury has a surface similar to this
- 24. The path of an object as it revolves around another object
- 25. This is the great red spot on Jupiter
Down
- 1. It often rains this type of acid on Venus
- 3. A scientist who studies the universe beyond Earth
- 4. A gas giant made of hydrogen,helium, and methane.
- 7. Saturns rings are made of dust and this
- 8. This gives Uranus
- 9. The outer planets
- 11. Saturn has a lot of these
- 12. A chunk of rock or dust in space
- 13. Six planet from the Sun
- 15. Rocky debris revolving around the Sun
- 17. Energy source for all the planets
- 20. This planet rotates on it's sides and has any moons
- 21. The closest planet to the Sun.