The Big Bang

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Across
  1. 1. the theory that explains how the universe was created
  2. 3. last name of physicist who discovered cosmic background radiation
  3. 5. one of the families that particles fall into
  4. 7. matter vs anti-matter
Down
  1. 2. how helium nuclei is formed
  2. 4. cosmic background radiation surfaces the entire ____
  3. 6. the antimatter counterpart of an electron