The Fort of the Physicists

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Across
  1. 4. abandoned by his mother at the age of three
  2. 5. discovery of radium and polonium,
  3. 7. and Buzz Aldrin have appeared
  4. 9. sitcom on which Stephen
Down
  1. 1. discovery of electrons and isotopes
  2. 2. discovery of the rings of Saturn
  3. 3. how light interacts with matter and how charged particles interact with each other
  4. 6. Best known for the study of relativity
  5. 8. the volume of a sphere is two-thirds the volume of a cylinder that encloses that