IDU: What does an astrophysicist do?

Host William Shatner knows a little bit about the universe and how it works. Just enough to be dangerous. But do you know who actually knows almost everything about it?

Astrophysicist and science communicator Neil deGrasse Tyson and he joins Mr. Shatner on this week's episode of 'I Don't Understand' to answer what an astrophysicist knows.