Across
- 2. Is composed of invisible particles you can't directly see.
- 3. Is a reaction when two atomic nuclei combine.
- 5. Lightest substance in the universe.
- 9. The process that creates new nuclei from pre-existing nucleons.
- 10. A gas with no taste, color or smell.
- 11. Light shifts shorter wavelengths as objects in space move closer to us.
- 12. All existing matter and space, created during the Big Bang.
- 13. Light shifts to longer wavelengths as objects in space move further away from us.
- 14. Describes changes in sound or light waves produced by a moving source.
Down
- 1. Represents all heat left over from the Big Bang.
- 4. Energy all around us that takes many forms.
- 6. Spectrum and range of all wavelengths EMR extends.
- 7. The name of the energy that is believed to be making the universe larger.
- 8. Theory that 13.8 billion years ago the universe expanded from a hot mass.