I agree about Bill Nye, that he's more of a science educator than expert about any one specific topic, but Tyson is definitely an expert on astrophysics. He tal

I agree about Bill Nye, that he's more of a science educator than expert about any one specific topic, but Tyson is definitely an expert on astrophysics. He talks about a lot of stuff that he isn't an expert in because he's a popular guy, and for that reason I'm not very fond of his speaking engagements, but it's not fair to say he's not an expert at anything.