Across
- 2. Force that attracts objects to each other, keeps planets in orbit
- 3. Region beyond Neptune's orbit, home to dwarf planets and icy objects
- 4. Group of stars that forms a recognizable pattern in the night sky
- 6. Brightest planet, with a thick atmosphere and high temperatures
- 8. Tilted planet, with a blue-green color due to methane in its atmosphere
- 11. Dwarf planet in the Kuiper Belt, once considered the ninth planet
- 12. Path followed by an object around another object in space
- 14. Our home planet, the only one known to support life
- 15. Group of planets, moons, and other objects orbiting the Sun
- 17. Bright streak of light in the sky caused by a space rock burning up
- 18. Coldest and windiest planet, with dark storm systems
Down
- 1. Natural or artificial object orbiting a planet, like the Moon
- 5. Rocky object orbiting the Sun, mostly found in the Asteroid Belt
- 7. Largest planet, a gas giant with many moons and a Great Red Spot
- 9. Central star of our solar system, a hot ball of gas
- 10. Icy object that forms a tail when it nears the Sun
- 13. Instrument used to observe distant objects in space
- 15. Planet famous for its beautiful rings made of ice and rock
- 16. Smallest and closest planet to the Sun
- 17. Red planet, with polar ice caps and ancient river valleys