Across
- 2. The first of the outer planets
- 6. It's called the blue planet.
- 7. The name of our gallaxy
- 8. Huge ball of gas where nuclear reactions take place
- 10. This person invented the telescope and proved Copernicus' theory.
- 12. This scientist suggested the heliocentric model of the solar system.
- 14. A rocky irregular mass that orbit the Sun
- 15. The most brilliant planet in the night sky.
- 17. Small pieces of asteroids or comet that orbit the Sun
- 18. It's the first day of Summer and Winter
- 19. Dwarf planet
Down
- 1. It's the name of a belt of asteroids
- 3. This movement of the Earth takes 24 hours
- 4. They are classified according to their shape.
- 5. Celestial body that orbit a star.
- 8. The nearest star to the Earth
- 9. Imaginary line that goes from the North Pole to the South Pole
- 11. The Equator is the imaginary line that divides the Earth into 2 _________________
- 13. A natural satellite that orbit the Earth
- 16. It occurs thanks to the Earth's revolution