Science revision

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Across
  1. 2. keeps the planets in place and spinning
  2. 5. the pull of the moon towards the water
  3. 7. changes from place to place
  4. 9. cloud of gas and dust in space
  5. 12. external part of a virus
  6. 13. the shape of the orbit of the planets
  7. 14. infects other cells
Down
  1. 1. number of planets in the solar system
  2. 3. space with no particles
  3. 4. unit of weight
  4. 6. slows down something that is falling down
  5. 8. marea in English
  6. 10. Earth satellite
  7. 11. unit of mass
  8. 15. is at the centre of the solar system