Across
- 3. A spectrum that includes light
- 6. The radiation with the longest wavelength
- 7. The most dangerous radiation
- 9. You can use this to see warm things
- 10. A star that is burning cool, near the end of its life
- 12. A group of stars
- 13. Radiation used in hospitals
- 14. The person who discovered that the universe is expanding
- 17. The study of the universe
- 19. White light
Down
- 1. The cloud in which stars are formed
- 2. Very attractive product of a very large star
- 4. The Greeks called this 'photo'
- 5. Can be dangerous; some animals can see it
- 8. The study of stars
- 11. When stars appear to move slightly relative to each other
- 15. The universe started with The Big ….?
- 16. The frequency used by Radars
- 18. A vibration in air or water