A few more names, including season 5
Aarti Mann- Priya Koothrappali
Neil deGrasse Tyson- Himself (American astrophysicist and science communicator)
Rick Fox- Glenn
Brian Greene- Himself (American theoretical physicist and string theorist)
Michael J. Massimino- Himself (American engineer and NASA Astronaut)
Leonard Nimoy- Himself (voice only)
Stephen Hawking- Himself
I have a feeling those Scientists and Astronauts would be popular autographs, especially if they aren't commons
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