Across
- 4. very short electromagnetic wave
- 7. an element present in the universe.
- 8. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
- 9. the basic building blocks of all atoms
- 10. space, matter, and energy
Down
- 1. evidence on the big bang theory
- 2. the distance between the arrival of peaks of a light wave; shorter wavelengths correspond to higher frequencies
- 3. theory on how the universe was created
- 5. the range of wavelengths or frequencies over which electromagnetic radiation extends
- 6. electromagnetic radiation that lies within the visible range