Katy Perry discovers the truth about her own Twitter profile, thanks to Neil deGrasse Tyson
Neil deGrasse Tyson show StarTalk renewed for season 3
Neil deGrasse Tyson reads mean tweets about his sci-fi film critiques
Neil deGrasse Tyson on StarTalk, Stephen Colbert being the brainiest celeb he's met
President Bill Clinton to appear on 'StarTalk' season 2 premiere
Neil deGrasse Tyson brings 'StarTalk' to TV and reveals his dream guest
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