Astronomy

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Across
  1. 1. Said the universe is cooling and expanding
  2. 2. Tiny particles that compose atomic particles
  3. 5. The birth of the universe
  4. 7. Formulated Theory Of Relativity
  5. 8. Protons, neutrons, and electrons
  6. 10. Third element on the periodic table
Down
  1. 1. First element on the periodic table
  2. 3. All existing matter and space
  3. 4. Has two protons
  4. 6. Ex. Milky Way
  5. 9. Relic radiation left over from the big bang