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I assume, that a) by Halo stars, you mean high velocity stars, and b) by disk stars, you mean stars that stay within the galaxy (Normal stars).Halo stars are usually very old stars that do no orbit the centre of the Galaxy the same way that our Sun or other stars in a galaxy. Rather, they travel in elliptical orbits, which often take them well outside the plane of the Galaxy.
Stars in the disk all orbit in the same direction and nearly the same plane, while halo stars have more randomly oriented orbits.Clusters of young stars are found only in the disk.Disk stars come in a broad range of masses and colors, while halo stars are mostly of low mass and red.Gas and dust are abundant in the disk but not in the halo.
The planets formed from a disk of gas and dust that surrounded the sun as it formed. This gas and dust clumped together to form the solar system. Two planets cannot occupy orbits that are too close together. If they do, interactions through gravity will either cause them to collide or get moved to different orbits.
Spiral galaxies form from the collapse of a protogalactic cloud. Spiral galaxies consist of three components: a rotating disk, a bulge and a halo. Spiral galaxies, like the Milky Way, owe their shape to stars inside the protogalaxy developing at different intervals. The gas between forming stars continues to be compressed, and the resulting gravitational differences manhandle the protogalaxy's stars, dust and gas. When the protogalactic cloud collapses, the stars in the bulge and halo form first. These stars have rather random orbits around the galactic center. The galactic center probably contains a supermassive black hole, which likely exerts some gravitational influence on the formation of a spiral galaxy. The remainder of the cloud forms a disk due to the conservation of angular momentum (the same effect as the spinning up of the dancer when she pulls her arms inside). This motion forces everything into a rotating disk, and additional differences in gravity build the spiral arms. Oppositely, when a protogalaxy's stars develop at the same time, you have an elliptical galaxy on your hands. The stars in the disk form later and thus the disk population of stars are younger than those in the bulge and the halo. Further, the stars in the disk rotate around the center of the galaxy in a collective, well defined way unlike the stars in the bulge and halo.
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The ones in the bulge or halo are older star, the ones in the disk are younger.
I assume, that a) by Halo stars, you mean high velocity stars, and b) by disk stars, you mean stars that stay within the galaxy (Normal stars).Halo stars are usually very old stars that do no orbit the centre of the Galaxy the same way that our Sun or other stars in a galaxy. Rather, they travel in elliptical orbits, which often take them well outside the plane of the Galaxy.
Yes, it orbits the galactic center.The sun is one of billions of stars that comprise the Milky Way galaxy - a more or less flat circular disk of stars that rotates about it's centre. Therefore, the sun "orbit" the centre of the galaxy in a manner analogous to how the earth orbits the sun.
The oldest stars are metal poor because they formed before there had been many supernova explosions to create and scatter metals into interstellar medium. Those stars formed long ago when the galaxy was young and motions were not organized into a disk, so the stars tended to take up randomly shaped orbits, many of which are quite elongated and eccentric. Consequently, today, the most metal poor stars tend to follow the most eccentric orbits.
also commonly called a herniated nucleus pulposus, prolapsed disk, ruptured disk, or
Population I stars
Spiral galaxies form from the collapse of a protogalactic cloud. Spiral galaxies consist of three components: a rotating disk, a bulge and a halo. Spiral galaxies, like the Milky Way, owe their shape to stars inside the protogalaxy developing at different intervals. The gas between forming stars continues to be compressed, and the resulting gravitational differences manhandle the protogalaxy's stars, dust and gas. When the protogalactic cloud collapses, the stars in the bulge and halo form first. These stars have rather random orbits around the galactic center. The galactic center probably contains a supermassive black hole, which likely exerts some gravitational influence on the formation of a spiral galaxy. The remainder of the cloud forms a disk due to the conservation of angular momentum (the same effect as the spinning up of the dancer when she pulls her arms inside). This motion forces everything into a rotating disk, and additional differences in gravity build the spiral arms. Oppositely, when a protogalaxy's stars develop at the same time, you have an elliptical galaxy on your hands. The stars in the disk form later and thus the disk population of stars are younger than those in the bulge and the halo. Further, the stars in the disk rotate around the center of the galaxy in a collective, well defined way unlike the stars in the bulge and halo.
It's the Nucleus
what is the thin gas and clusters of stars surrounds the disk of the Milky Way Galaxy.
The stars throughout the disk.
Yes
Stars in the disk all orbit in the same direction and nearly the same plane, while halo stars have more randomly oriented orbits.Clusters of young stars are found only in the disk.Disk stars come in a broad range of masses and colors, while halo stars are mostly of low mass and red.Gas and dust are abundant in the disk but not in the halo.