Across
- 7. Distance light travels in one year
- 8. Closest planet to the Sun
- 9. Imaginary line through the center of a planet around which it rotates
- 10. Tool used to observe distant planets and stars
- 13. Bowl-shaped depression caused by impacts on a planet or moon
- 16. Path that a planet or satellite follows around a star or planet
- 17. Shooting star that enters Earth's atmosphere
- 18. Vacuum beyond Earth's atmosphere
- 19. Spinning of a planet on its axis
- 21. The star at the center of our Solar System
- 22. Imaginary line around the middle of a planet
- 23. Force that attracts objects toward each other
- 26. Our home planet, third from the Sun
- 27. Once considered the ninth planet, now a dwarf planet
- 28. Eighth planet from the Sun, known for strong winds
- 29. Period for a planet to complete one rotation
- 30. Circular structures of ice and rock around some planets
Down
- 1. Icy body that develops a tail when near the Sun
- 2. The Red Planet with iron oxide on its surface
- 3. Layer of gases surrounding a planet
- 4. Seventh planet from the Sun, tilted on its side
- 5. Measure of how hot or cold a planet is
- 6. Largest planet in the Solar System
- 11. Movement of a planet around the Sun
- 12. Sixth planet from the Sun, famous for its rings
- 14. The galaxy that contains our Solar System
- 15. Sun and all objects that orbit it
- 17. Earth's natural satellite
- 20. Time taken for a planet to complete one orbit around the Sun
- 23. System of stars, dust, and gas bound by gravity
- 24. Small rocky body orbiting the Sun, mainly between Mars and Jupiter
- 25. Second planet from the Sun, often called Earth's sister