Big bang

123456789
Across
  1. 1. what the universe is full of
  2. 4. planets moving towards us
  3. 5. system of millions or billions of stars
  4. 8. expansion
  5. 9. One of the first elements
Down
  1. 2. microwave radiation
  2. 3. person who originated the theory of the
  3. 6. One of the first elements
  4. 7. planets moving away
  5. 8. all existing matter