Across
- 3. Once considered a planet, now classified as a "dwarf planet"
- 7. The layer of gases surrounding a planet
- 9. The group of celestial objects that orbit the sun
- 11. The red planet
- 16. The scientific study of the universe and celestial objects
- 18. The spinning of a planet on its axis
- 19. A collection of millions or billions of stars, along with gas and dust
- 20. The farthest planet from the sun
- 21. Natural satellite of a planet
- 22. The largest planet in our solar system
- 23. A solid object that originates in the solar system
Down
- 1. Smallest planet in our solar system
- 2. Planet known as Earth's twin
- 4. A device used to observe distant objects
- 5. The force that attracts objects towards the center of mass
- 6. The galaxy Earth is located in
- 8. The force that attracts objects towards the center of mass
- 10. The vast expanse that exists beyond Earth's atmosphere
- 12. Small rocky or metallic bodies that orbit the sun
- 13. Planet with rings
- 14. Planet that rotates on its side
- 15. Planet we call home
- 17. A meteoroid that has survived its passage through the Earth's atmosphere.
- 24. The path a celestial object follows around a larger object