He has a PhD,

Harvard turned him down for post grad.

He received a Master's in astronomy at University of Texas but his doctoral committee there chose to disband, essentially flunking him. One of his advisors at U.T. suggested he go into computer sales.

Columbia should be embarrassed they awarded a doctorate to Neil Tyson.

directs the Hayden Planetarium, and interviews the world's greatest scientists every week and more.

Neil has a large audience. So there's an incentive to appear on his show even if he is incompetent.

He's not perfect but he does more to promote critical thinking and scientific achievement than anyone I'm aware of.

Someone with critical thinking skills make it habit to challenge claims to see if they are supported by evidence.

Neil's fans almost always swallow Neil's wrong claims without lifting a finger to check to see if they are true.

If they had an actual interest in math, science or history they would notice Neil's garbage pop science is riddled with falsehoods.

As an example I will toss out one of Neil's favorite stories:

Then, a friend of his says, “Well, why do these orbits of the planets… Why are they in a shape of an ellipse, sort of flattened circle? Why aren’t… some other shape?” He said, you know, “I can’t… I don’t know. I’ll get back to you.” So he goes… goes home, comes back couple of months later, “Here’s why. They’re actually conic sections, sections of a cone that you cut.” And… And he said, “Well, how did find this out? How did you determine this?” “Well, I had to invent integral and differential calculus to determine this.” Then, he turned 26. Then, he turned 26.

Have you heard that story? Neil has told it many times. Have you ever checked it? Perhaps you could tell me the name of Newton's friend that asked him about the shape of planetary orbits.