THE UNIVERSE

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