TV highlights: 'The Daily Show With Jon Stewart' plays host to Neil deGrasse Tyson

(All times Eastern) After witnessing a ghastly car accident, Derek springs into action in hopes of saving the lives of those involved on "Grey's Anatomy" (ABC at 8 p.m.). Raj struggles with the idea of life without his parents' trust fund on "The Big Bang Theory" (CBS at 8) while the rest of the gang is faced with the horror of having to call tech support.