It’s a dream come true for ‘The Big Bang Theory:’ world renowned British physicist and cosmologist Stephen Hawking will guest star on the sitcom early next month. A press release said Hawking, 70, will “share his beautiful mind with his most ardent admirer, Sheldon Cooper”. “When people would ask us who a ‘dream guest star’ for the show would be, we would always joke and say Stephen Hawking,” executive producer Bill Prady said, “knowing that it was a long shot of astronomical proportions. In fact, we’re not exactly sure how we got him.”