Across
- 2. System A collection of planets orbiting a star
- 3. A local collection of stars and planets orbiting a central point
- 4. A device that allows objects in the sky to be magnified
- 6. Length The distance between a lens and a focussed image
- 7. A vibration that transfers energy but not material
- 8. Image An image that can be seen but not projected onto a screen
- 9. Wave A wave where the vibration is perpendicular to the direction of travel
- 10. Suggests that all objects orbit the Sun
- 16. Maximum displacement of a wave
- 18. Suggests that all objects orbit the Earth
- 19. A device for bending light rays
Down
- 1. The increase in size of an image from a telescope
- 2. A device for splitting light into its separate components
- 5. Image An image that can be projected onto a screen
- 7. The distance between two equal parts of a wave
- 11. Wave A wave where the vibrations are in line with the direction of travel
- 12. The bending of a wave as it travels from one material to another at an angle
- 13. The lens of a telescope placed closest to the eye
- 14. Lens The lens that is pointed towards the object to be viewed
- 15. The number of waves that pass a certain point each second
- 17. The Universe contains all of space