Television News Stephen Hawking to guest star on CBS' 'The Big Bang Theory' sitcom 03/13/2012 British theoretical physicist and cosmologist Stephen Hawking is to guest star on the U.S. sitcom "The Big Bang Theory," CBS said Tuesday. Read More RELATED NEWS Jimmy Fallon's 'The Tonight Show' dropping to only four nights a weekAshley Tisdale announces birth of her second childSelena Gomez is a billionaire TAGS: Jim Parsons Kaley Cuoco Bill Prady Johnny Galecki The Big Bang Theory
