Across
- 2. Closet planet to the Sun
- 5. Balls of burning nuclear energy
- 6. The Red Planet
- 8. Has a fixed volume, but no fixed shape
- 10. Fastest thing in the universe
- 11. Molecular motion
- 13. Basic building block of a substance
- 16. An icy ball of rock
- 17. A satellite around a planet
- 20. Has a fixed shape and volume
- 21. Has a positive charge
- 22. Gas giant
- 24. Has no charge
Down
- 1. Flow of electrons
- 3. A singularity with extremely strong gravity
- 4. Has no fixed volume
- 7. The biggest planet in our solar system
- 9. Building block of matter
- 12. Has a negative charge
- 14. Hottest planet in the solar system
- 15. Anything that flows
- 18. Farthest planet from the Sun
- 19. A cluster of stars, dust, gas, etc.
- 21. Dwarf planet
- 23. The Jewel of the Solar System