What is a star?
Stars are
large balls of hot gas. They also away our many and many
light years. They almost are
bigger and brighter than the Sun. A star is made of in giant clouds of dust and gas called
stellar nebula. As the star become smaller and hotter,
nuclear reactions start in the middle, and the star will be born.
The four type of stars
Stars have many characteristics, luminosity is the stars brightness between 0.0001(Dim) to 1,000,000(Bright). Different zone of the stars have the different color, like red orange, yellow, white and blue,etc. The stars big size or smal size. The stars temperature are cooler or hotter between
2,000°C to 30,000°C. Spectral class is a letter tells the temperature of stars.
Scientists grouped 4 types of their size, temperature and luminosity. The four types of stars named White Dwarfs, Main Sequence Stars, Supergiants and Giants. White Dwarfs are the oldest stars.They color also is white. They are the dimest but the third hotter stars(7,500°C-10,000°C). They almost is the small stars.Main Sequence Stars are the many stars gather like a large slash. They color, liminosity, mass and color is not sure because they have many stars and different.Supergiants are the middle age stars. They are the brightest but temperature is not sure(2,000°C-10,000°C). They color also is yellow, orange and red. They almost is the biggest stars.Giants are the middle age stars. They are the bright and cold star(3,000°C-7,000°C).They color also is red.
H-R Diagram
H-R diagram is agraphical tool to classify stars according to their luminosity, spectral class, color, temperture and evolutionary stage.
Nuclear Fusion
Nuclear Fusion is the process about a star change two hydrogen gas molecules into helium molecule.
Nuclear Fusion create energy of stars.
The life of stars
All stars is made of a giant cloud,it has gases and dust. Called Stellar Nebula. It can made the three type of star.
First is Sun-Like Star, it is the yellow and the small stars, than,in its middle age, it will start to become a red giant, a red small star. Than, they will become a planetary nebula, a cloud dust and gases. And together again, become a white dwarf. In the white dwarf finally, it will start to become a cold, dark object. Called Black Dwarf.
Next is Huge Star, it same of Sun-Like Star is the yellow stars, but bigger than they, than, it will start to become a red super giant, a red star, but bigger red giant. Then, the red super giant burst, called Supernova. After that, it will became a small, very fast star. Called Neutron Star.
Last is Giant Star, it is a blue, and very big star, than, it will start to become a red super giant, a red and big stars. Then, the red super giant burst, called Supernova. After that, it will became a hole that can sucking everything around it in to nowhere. Called Black Hole.
