Across
- 4. Unit of measurement of for power
- 5. The theory that all planets orbit around the Earth
- 7. The number of waves passing through a point per second
- 8. Astronomer who helped disproved geocentric by looking at the moons of Jupiter
- 11. A type of wave where particles move at right angles to the direction the wave is moving
- 13. The system where planets orbit the sun
- 15. Sound waves that are bellow 20Hz
- 16. The unit of measurement of frequency
- 17. When an object is moving away from us and its wavelength becomes longer
- 19. A type of lens that is curved on both sides to make it thicker in the middle
- 22. The second stage in the life of a star
- 24. The colour that is best for absorbing heat
Down
- 1. A type of wave that travels through the Earth
- 2. Light that we can see with the naked eye
- 3. The theory that the universe has always existed
- 6. Change in direction of light
- 9. Flow of charged particles
- 10. How good a device is at creating useful energy
- 12. The surface of the earth
- 14. A type of wave where particles move back and forth in line line with the direction of the wave
- 18. Astronomer who discovered infrared
- 20. This has the smallest wave length on the EM-spectrum
- 21. A change in the DNA caused by radiation
- 23. The man who discovered ultraviolet