Big ban🔥g🔥🔥🔥🔥🔥

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Across
  1. 1. a system of millions and billions of stars
  2. 3. oldest microwaves
  3. 4. made up of all matter and space
  4. 6. a subatomic particle of a class that is thought to bind quarks together.
  5. 8. the spectrum used to study light
  6. 10. the expansion of the universe
Down
  1. 2. what all matter is composed of
  2. 5. one of the first elements
  3. 7. the force that attracts a body to a another body
  4. 9. a massive self-luminous body of gas that shines