Big Bang Theory

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Across
  1. 4. Abbreviation for the particles left behind by the big bang.
  2. 5. All matter and space that exists
  3. 6. The Theory of what created everything in the universe
  4. 7. 25% of the universe
  5. 8. The person who created the Theory of relativity
Down
  1. 1. Quarks, Protons, Neutrons, and Electrons
  2. 2. The first element created and the most abundant in the universe
  3. 3. The person who discovered galaxy separation