Galactic Dynamics -

: These are not permanent "arms" but density waves where stars and gas momentarily slow down, triggering star formation.

Galactic dynamics is the study of how stars, gas, and dark matter move within galaxies under the influence of gravity. It combines orbital mechanics, statistical physics, and fluid dynamics to explain the structure and evolution of these massive systems. Core Principles of Galactic Motion Galactic Dynamics

: Stars closer to the center orbit faster than those further out. : These are not permanent "arms" but density