Galactic - Dynamics
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: Many galaxies, including our own, have a central bar that funnels gas toward the center, feeding the central black hole. 2. The Galactic Halo & Bulge
: Stars closer to the center orbit faster than those further out. Galactic Dynamics
: Visible matter cannot explain observed orbital speeds. A massive, invisible dark matter halo is required to keep galaxies from flying apart. Key Dynamical Components 1. The Galactic Disk : Many galaxies, including our own, have a
: These are not permanent "arms" but density waves where stars and gas momentarily slow down, triggering star formation. : Visible matter cannot explain observed orbital speeds
: Unlike gas particles, stars rarely "hit" each other. Their motion is dictated by the smoothed-out gravitational potential of the entire galaxy rather than individual encounters.
: Star paths are determined by the galaxy's shape (spherical, axisymmetric, or triaxial). In a disk, stars follow epicyclic orbits —small oscillations around a circular path.
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