What are the parts of a spiral galaxy?

Spiral galaxies have three visible parts: a thin disk composed of stars, gas, and dust; a central bulge of older stars; and a spherical halo of the oldest stars and massive star clusters.

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One may also ask what is the center of a spiral galaxy called?

The bulk of the stars in a spiral galaxy are located either close to a single plane (the galactic plane) in more or less conventional circular orbits around the center of the galaxy (the Galactic Center), or in a spheroidal galactic bulge around the galactic core. What is the spherical region of a spiral galaxy? Astronomy Terms - Chapter 12 A B Halo The spherical region of a spiral galaxy, containing a thin scattering of stars, star clusters, and small amounts of gas. Instability strip The region of the H-R diagram in which stars are unstable to pulsation. A star passing through this strip becomes a variable star. 27 more rows

What type of galaxy is a spiral galaxy?

The most common type of galaxy is called a "spiral galaxy." Not surprisingly, spiral galaxies look like spirals, with long arms winding toward a bright bulge at the center. Spiral Galaxies. Galaxy Type Description Sc spiral galaxy, type c SBa barred spiral galaxy, type a SBb barred spiral galaxy, type b SBc barred spiral galaxy, type c 2 more rows Consequently, where are spiral galaxies found? Spiral galaxies are mostly found in low-density regions of the Universe (i.e. with not many other galaxies nearby). It is rare to find them in the middle of galaxy clusters. Our own galaxy, the Milky Way, is thought to be a spiral galaxy with a central bar.

Consequently, how are spiral galaxy formed?

Astronomers believe that a galaxy's spiral structure originates as a density wave emanating from the galactic center. The idea is that the entire disk of a galaxy is filled with material. As this density wave passes through, it's thought to trigger bursts of star formation.