Question

What are basic characteristics of stars' orbits in the disk, halo, and bulge of our galaxy? what are basic characteristics of stars' orbits in the disk, halo, and bulge of our galaxy? the disk stars have nearly circular orbits. they have vertical motions out of the plane, making them appear to bob up and down, but they never get "too far" from the disk. orbits of stars in the bulge and the halo of the galaxy are much less orderly, traveling around the galactic center on elliptical orbits with more or less random orientations. the halo stars have nearly circular orbits. they have vertical motions out of the plane, making them appear to bob up and down, but they never get "too far" from the halo. orbits of stars in the bulge and the disk of the galaxy are much less orderly, traveling around the galactic center on elliptical orbits with more or less random orientations. the bulge stars have nearly circular orbits. they have vertical motions out of the plane, making them appear to bob up and down, but they never get "too far" from the bulge. orbits of stars in the disk and the halo of the galaxy are much less orderly, traveling around the galactic center on elliptical orbits with more or less random orientations?

Answer 1

Largest number of stars in our galaxy is located in a disk. They have nearly circular orbits around black hole which is located in a center of galaxy. Orbits of all these stars have same orientation. Some of orbits have small inclination which causes for stars to move little up and down.

Halo stars are located in a "bubble" around our galaxy. These stars travel high above and far below the disk on orbits with random orientations. These are stars that once were located in a disk but they went outside of it.

Bulge stars are located in a center of our galaxy. They also orbit black hole and they have much shorter period of orbit than all other stars in a galaxy. Their orbits have random orientations.