The Big Bang

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Across
  1. 4. is a decrease in wavelengths
  2. 6. is a instrument for dispersing radiation
  3. 7. is used to study light
  4. 9. a theory that suggests that our universe is always expanding
Down
  1. 1. is a light that human eyes can see
  2. 2. is made up of all matter in space that exists
  3. 3. particles is what all matter is composed of
  4. 5. is the branch of science which deals with celestial objects and the physical universe as a whole
  5. 8. left over radiation from the big bang