corridor at Caltech . Raj introduces Dr Tyson to Sheldon , who dismisses him out of hand due to Tyson's involvement with the "demotion" of Pluto ] to minor planet status. Retrieved from " http://wiki.the-big-bang-theory.com/index.php?title=Tyson,_Neil_deGrasse&oldid=5851 " Categories : Actors Astronomy Celebrity actors 0407 Views Page Discussion View source History Personal tools