#stellar structure

[thymesignature]

If you think about it, the cooling portion of stellar convection is just amigara in reverse.

[cosmosscience]

Formation & Stellar Structure 3/6

Ever wondered how Star's form? Well, here you go!

A star develops from a giant, slowly rotating cloud that is made up entirely or almost entirely of hydrogen and helium. Due to it's own gravitational pull, the clouds begins to collapse inward, and as it shrinks, it spins more and more faster, with the outer parts becoming a disk while the innermost parts become a roughly spherical clump. This collapsing material grows hotter and denser, forming a ball shaped protostar. When the heat and pressure in the protostar reaches about 1 million degrees C, atomic nuclei (that normally repel each other) start refusing together, and the star ignites. Nuclear fusion converts a small amount of the mass of these atoms into extraordinary amounts of energy - for instance, 1 gram of mass converted entirely to energy would be equal to an explosion of roughly 22,000 TNT.

Want to know how Star's work?

The structure of a star can often be though of as a series of thin nested shells, somewhat like an onion.

A star during most of its life is a main-sequence star, which consists of a core, radiative and convective zones, a photosphere, a chromosphere and a corona. The core is where all the nuclear fusion takes places to power a star. In the radiative zone, energy from these reactions is transported outward by radiation, like heat from a light bulb, while in the convective zone, energy is transported by the roiling hot gases, like hot air from a hairdryer. Massive stars that are more than several times the mass of the sun are convective in their cores and radiative in their outer layers, while stars comparable to the sun or less in mass are radiative in their cores and convective in their outer layers. Intermediate-mass stars of spectral type A may be radiative throughout. 

  After those zones, comes the part of the Star that radiates Visible light, the photosphere, which is often referred to as the surface of the star. After that is the chromosphere, a layer that looks reddish because of all the hydrogen found there. Finally the outermost of a star's atmosphere is the corona, which is super-hot.

1 = Star History. (http://cosmosscience.tumblr.com/post/4444881748/star-history-1-6#notes)

2 = Star naming Designations.  (

http://cosmosscience.tumblr.com/post/4611746849/star-naming-designations-2-6)

3 = Formation & Stellar Structure.

4 = Evolution. 

5 = Binary stars and other multiples.

6 = Characteristics