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Galactic Disc,Galactic Nucleus,Galactic Halo

Galactic Disk :

It is the thinnest part of a spiral galaxy. The disk surrounds the nuclear bulge and contains a mixture of old and young stars, gas, and dust. In the case of the Milky Way, it extends out some 50,000 light-years from the Galactic center but is only about 1,000 light-years thick. The dust in the disk (a few hundred light-years thick) creates the dark ribbon that runs the length of the Milky Way and limits the view of our own Galaxy (see dust lanes).

Galactic nucleus :

It is the core of a spiral galaxy. In the case of Seyfert (active) galaxiesthe nucleus is extremely luminous in the radio wavelengths.

Galactic Halo :

It is  large (50,000 light-year radius) sphere of old stars surrounding the galaxy.

About Mrigendra Patel

Mrigendra Patel is the Administrator of this blog. He is an Engineering Student having keen interest in Music and Computer Science. He shares his knowledge to the world by posting Guitar Tabs and other Computer related topics.

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