Across
- 3. known as "the red planet"
- 4. a celestial body of gas; the category our Sun is in
- 5. 4.5 billion-year-old yellow dwarf star that is the center of the Solar System
- 9. an area of space beyond Neptune's orbit containing small rocks thought to be remnants from the formation of the Solar System
- 13. the four outer planets in the Solar System with gaseous bodies and rings
- 16. the closest planet to the Sun
- 17. the four planets closest to the Sun with rocky cores
- 18. the planet famous for its rings
- 20. nicknamed "dirty snowball(s)", it is composed of an icy, rocky core with two tails that point away from the Sun
- 21. small celestial bodies living in the Kuiper belt that may have existed since the birth of the Solar System
- 23. a celestial body that lies in the _______ belt between Mars and Jupiter
- 24. an abbreviation of objects that orbit the Sun at a farther distance than Neptune
Down
- 1. an object that orbits another celestial object
- 2. celestial objects that do not belong into the category of a planet or moon
- 3. a small, rocky object that is heated up as it enters the Earth's atmosphere
- 5. made up of the Kuiper Belt and the Oort Cloud
- 6. classified as a dwarf planet since 2006
- 7. the largest planet in the Solar System
- 8. the distance in which a ray of light would travel in one year
- 10. the collection of eight planets and their moons around the Sun
- 11. the planet located in the habitable zone
- 12. a cloud of icy planetesimals that exists 50,000 AU from the Sun
- 14. the hottest planet in the Solar System
- 15. a celestial body that is in orbit around the Sun
- 19. the planet that spins on its side
- 22. the farthest planet from the Sun