The Solar System

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Across
  1. 3. When a planet spins on its axis.
  2. 6. There are billions of these visible in the night sky.
  3. 7. The number of planets in our solar system.
  4. 10. Large rocks that orbit the sun.
  5. 12. Used to measure distance in space.
  6. 15. The oval path that the planets move in.
  7. 17. Often seen in the night sky as a shooting star.
  8. 19. The closest planet to the sun.
  9. 22. A scientist who studies space.
  10. 23. The force that holds everything in place.
  11. 25. Frozen dust and gas which orbits the sun, often seen with a tail.
  12. 27. The smallest of the gas giants.
  13. 28. The planet known as the Red Planet.
  14. 29. The abbreviation of the National Aeronautics and Space Administration.
Down
  1. 1. Now known as a 'dwarf planet'.
  2. 2. A grouping of stars.
  3. 4. The Italian astronomer who confirmed that the sun is the centre of the solar system.
  4. 5. The largest planet in our solar system.
  5. 6. The planet famous for its rings.
  6. 8. The first astronomer to explain solar and lunar eclipses.
  7. 9. When a star explodes it is called a...
  8. 11. One of the planets composed only of gas.
  9. 13. Is made up of the sun, planets, comets, asteroids and meteors.
  10. 14. The name of our galaxy.
  11. 16. Earth is considered to be one.
  12. 18. Provides all things with life.
  13. 20. The only planet that water is in liquid form.
  14. 21. The astronomer to suggest that the sun is the centre of the solar system.
  15. 24. The planet known as the Morning Star.
  16. 25. The organisation that operates the Australia Telescope National Facility.
  17. 26. A natural satellite.