Before today, I'd been led to believe that collections of only one (or few) types of matter could never exist: And to my surprise it is indeed possible to have degenerate matter, resulting from the death of less massive stars! So I'm curious: If these lesser massive stars collapse due to their inability to maintain fusion, how is it that these massive collections of degenerate matter can even exist? How is it possible that you could have (near) pure degenerate matter on such an immense scale? This is an interesting dilemma, because the next obvious question is what causes pressure in these stars? Supposedly the pressure originates from the Pauli-Exclusion principle alone? But considering the size of it's constituent particles, how can these stars have such a large volume?