The Fort of the Physicists

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