The Stars



A STAR

What is a star?


A Star is a ball of hot gas held into the space by it's own gravity. The hot gas of the star it's right inside in the middle of the star, the interior heat and radiation is provided by nuclear reactions.A star has to go thought different phases and is classified by seven different types of characteristics, this characteristics are; luminosity, type, age, size, color, spectral class, and temperature. Each star has it's own name.All the stars are born in a big cloud of gas and dust call Stellar Nebula after the Stellar Nebula all of the star have to go through different phases.


Types of Stars




Types of Stars



There are different types of stars. The most know stars are classified in those four type of stars; Supergiants, Giants, Main Sequence and White Dwarfs. The Supergiants are one of the largest stars, also they are middle age, they are very bright stars and the temperature of the supergiants is middle, most of them are red and the spectral class is from M to A (2,000-10,000). The Giants are cold, bright, they mostly red, they not so big but not small stars, the giants spectral class is M to K (2,000-4,900). The Main Sequence, well the main sequence stars have all the size's, color's, temperature, luminosity, all the spectral class M to O (2,000-50,000), because they everywhere. The White Dwarfs, those stars are hot stars, but dim stars, the color of those stars are white and blue white, those stars are very small and the spectral class for those stars is G to B (4,900-28,000).

H-R Diagram




H-R Diagram



The H-R Diagram (The Hertzsprung-Russell Diagram) is a graphical tool that the astronomers use to classify stars according to their luminosity, spectral type, color, temperature and type.  This diagram describe the characteristics of each star. This diagram is very helpfull to clasiffy a star by they own characteristics. The H-R Diagram contain the luminosity, color, surface temperature, size and the type of the star with the name of each star.

Nuclear Fusion




Nuclear Fusion



A nuclear fusion is the the nuclear reaction inside a star, that change two hydrogen gas molecules into a helium molecule. Because of the nucelar reaction a satr is born. The process is big clouds of gas (Stellar Nebula),  then they become smaller because of the gravity, the the satr become hotter and after that the nuclear reaction satrt int he middle and a star born.

The Life Cycle of a Star




The Life Cycle of a Star

All the stars are born in a giant cloud of gas call Stellar Nebula, but all the stars go throught different cycle, it's depend on the type of star it is. The Sun Like stars are born like all stars in the Stellar Nebula, then it become a Red Giant, then it become a Planetary Nebula a star made of gases of the explotion of the Red Giant, then it become a White Dwarf and after that it ends with a Black Dwarf a cold satr that become less and less bright. The Huge Stars, born in the Stellar Nebula, then it become a Red Super Giant, after that it become a Supernova a star created because the explosion of a star, the red supergiant, finally it become a Neutron Star a star formed after the supernova explode, is small and spin really fast. And at least the Giant Star, born in the Stellar Nebula, then it become a Red Super Giant, after that a Supernova a star created because the explosion of a star and finally it become a Black Hole a star that is invisible and make everything that goes in dissapear.