Waves and the solar system

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Across
  1. 6. The circular path that a planet takes when moving around the sun
  2. 7. The number of complete wave cycles passing through a point every second
  3. 10. The distance and direction of a point on the wave from the equilibrium position
  4. 13. In this model, the Earth is believed to be the centre of the universe
  5. 14. The maximum displacement of a wave
  6. 15. wave This sort of wave has its particles moving at right angles to the direction of wave movement
  7. 16. This famous Italian scientist viewed astronomical objects through a telescope
Down
  1. 1. The distance between the lens and the sharp image formed (2 words)
  2. 2. The change of direction and speed of a wave when it meets a different medium
  3. 3. This is the distance between two equivalent points on consecutive waves
  4. 4. This type of lens has two convex surfaces
  5. 5. Examples of this sort of wave include sound waves and earthquake P waves
  6. 8. This type of telescope uses two mirrors to collect and focus light
  7. 9. Data from astronomical studies confirms this model of the solar system which places the sun at the centre
  8. 11. This type of image cannot be formed on a screen
  9. 12. This type of telescope has an objective lens