My first post on this website is the first of five that provide insights into the very misunderstood topic of why galactic spirals are spirals. Here we introduce the two matter ingredients that are necessary to create the structure – hydrogen and a central gravitational structure (a black hole will do). I also introduce the concept of self-gravity via Newton’s Shell Theory – and why a “collapsing molecular cloud” neither explains a galaxy, nor even star formation. Also introduced, is the concept of thermodynamics and how two forms of the same material (hydrogen) makes galaxies even more interesting,
A Bunch of Hydrogen – Galactic Spiral Structure (Part 1)
