The Solar System

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Across
  1. 4. Small, Cold, Hard and Rocky Planet
  2. 7. powerful and luminous explosion of a star
  3. 9. large telescope
  4. 12. giant cloud of dust and gas in space
  5. 13. the universe is ...
  6. 17. Ziggy __________ OR David Bowie
  7. 20. remote incandescent body like the sun
  8. 21. an area of activity, interest, or influence
  9. 22. particle of matter that uniquely defines a chemical element
  10. 23. all existing matter and space considered as a whole
  11. 25. most abundant element found in the sun and in the allende meteorite
Down
  1. 1. system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
  2. 2. You cannot walk on this planet, rather you would float.
  3. 3. Formed when supernovas explode
  4. 5. Cosmic background radiation explorer
  5. 6. force that attracts a body towards the centre of the earth
  6. 8. developing planets
  7. 10. the only planet to roll around the sun in its orbit. The rest spin.
  8. 11. H2
  9. 14. new Star
  10. 15. Planet like asteroids
  11. 16. Italian astronomer, physicist and engineer, sometimes described as a polymath
  12. 18. new planet
  13. 19. another name for the universe
  14. 24. H1