Editing Galactic Structure (section)

== <span style="color: #FFFFFF;">Remembering</span> ==
* '''Galaxy''' — A massive system of stars, gas, dust, and dark matter held together by gravity.
* '''The Milky Way''' — The spiral galaxy that contains our Solar System.
* '''Spiral Galaxy''' — A flat, rotating disk containing stars, gas, and dust, with a central concentration of stars (Bulge).
* '''Elliptical Galaxy''' — An oval-shaped galaxy with older stars and very little gas or dust.
* '''Irregular Galaxy''' — A galaxy with no specific shape, often distorted by the gravity of other galaxies.
* '''Galactic Bulge''' — The central, densely packed region of a galaxy.
* '''Galactic Disk''' — The flat part of a spiral galaxy where the spiral arms are located.
* '''Galactic Halo''' — A spherical region surrounding a galaxy containing old stars and globular clusters.
* '''Supermassive Black Hole (SMBH)''' — A black hole millions or billions of times the mass of the Sun, found at the center of most galaxies.
* '''Interstellar Medium (ISM)''' — The matter (gas and dust) that exists in the space between the star systems in a galaxy.
* '''Dark Matter''' — An invisible substance that makes up about 85% of the matter in a galaxy; it provides the gravity that stops galaxies from flying apart.
* '''Globular Cluster''' — A dense, spherical collection of ancient stars found in the halo.
* '''Quasar''' — An extremely bright galactic center powered by an active supermassive black hole.
* '''Light Year''' — The distance light travels in one year (about 6 trillion miles).
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