what is a star
A star is a giant ball of gas and dust with very hot temperature. Star are sometimes very big even bigger than the sun. howvever they look very small to us on earth and are only visible at night time. It is hot because in the center it has nuclear fusion. they can be different colors and sizes. Types of stars
There are four types of stars. First there are the supergiants these stars have the highest luminosity and different degree of temperature. Secondly there are the white dwarfs these stars are white and have the lowest luminosity and high temperature. Thirdly there are the giants but there are different kinds: there are the redgiants, the bluegiants and the yellowgiants. These stars have highest luminosity and low temperature. Lastly there are the main sequence stars these stars have different luminosity temperature and sizes.H-R Diagram
Nuclear fusion A star is a giant ball of hot gas. In the extremely hot center there’s nuclear reaction, it turns two hydrogen gas into helium molecule this process is called nuclear fusion it creates energy.
The life cycle of a stars 
First of all the star assembled inside of the stellar nebula then it becomes a sun-like-star then it grows into red giant after it explode into a planetary nebula then the pieces pack up together to become a white dwarf and get smaller into a black dwarf.
First of all the star assembled inside of the stellar nebula then it becomes a sun-like-star then it grows into red giant after it explode into a planetary nebula then the pieces pack up together to become a white dwarf and get smaller into a black dwarf. It is created inside of the stellar nebula, it become a huge Star then it gets bigger into red super giant then it immensely explode into supernova after it gets small into a neutron star.
It is created inside of the stellar nebula, it become a huge Star then it gets bigger into red super giant then it immensely explode into supernova after it gets small into a neutron star.
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