BBT

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