The Solar System

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