Galaxy: Difference between revisions
added Galactic disk info and major and minor arms |
m added Earth is in the Orion-Cygnus Arm |
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==== Galactic Disk ==== | ==== Galactic Disk ==== | ||
The galactic disk is the flat region that extends outward from the dense central bulge (center) to the sparse outer edge. The vast majority of star systems are located there including [[Sol]]. The spiral arms with lots of stars, gas and dust. The Milky Way is a barred spiral galaxy, because the spiral arms are attached to the central bar of stars in the core. The 2 major spiral arms are the Scutum-Centaurus Arm ([[Inner Scutum-Centaurus Arm]] and [[Outer Scutum-Centaurus Arm]]), and the [[Perseus Arm]]. Minor-arms are the [[Orion-Cygnus Arm]], [[Sagittarius-Carina Arm]], [[Outer Arm]] and [[Norma Arm]]. | The galactic disk is the flat region that extends outward from the dense central bulge (center) to the sparse outer edge. The vast majority of star systems are located there including [[Sol]]. The spiral arms with lots of stars, gas and dust. The Milky Way is a barred spiral galaxy, because the spiral arms are attached to the central bar of stars in the core. The 2 major spiral arms are the Scutum-Centaurus Arm ([[Inner Scutum-Centaurus Arm]] and [[Outer Scutum-Centaurus Arm]]), and the [[Perseus Arm]]. Minor-arms are the [[Orion-Cygnus Arm]], [[Sagittarius-Carina Arm]], [[Outer Arm]] and [[Norma Arm]]. The [[Sol|Sol system]], including [[Earth]], reside in the Orion-Cygnus Arm. | ||
==== Central Bulge ==== | ==== Central Bulge ==== | ||