As we know, stars look pretty much the same but that is not the case, there are several different kinds of stars in the sky. Here is a look at the kinds of stars of stars in the sky.
The Supergiant Stars:
These are the biggest stars in the sky. They are multiple times bigger than the sun. As you know, stars burn by consuming the hydrogen that is in them, super giants burn their hydrogen faster than smaller stars because they consume a lot more hydrogen than other smaller stars like the sun. It is estimated that the super giants will be no more in the next few million years because of the speed at which they consumes their energy.
The Neutron Stars:
These kinds of stars in the sky are formed when a supernova explosion occurs. Supernova is a way stars burn up by the collision of protons and electrons so that the neutrons only remain. These remaining neutrons form the neutron stars.
Red Dwarf Star:
Most of the kinds of stars in the sky are the Red Dwarf Star. They are lighter than the sun and they are less hot than the sun. They have less amount of hydrogen remaining in their core.
White Dwarf Stars:
These are those stars that have used up all the hydrogen in them and they are starting to cool down. They normally collapse inward so becoming smaller when the hydrogen is used up. They still keep the shining from the outside because they were once burning.
Red Giant Stars:
When some stars collapse after using up their hydrogen, they collapse inward therefore igniting the remaining hydrogen makes it seem to continue its life. When all the hydrogen is used up, it ignites Helium and other remaining elements. When the star is consuming the last of its fuel, it is called the red phase. This takes a few million years before the fuel is completely used up and they become White Dwarf Stars.
Main Sequence Stars:
What is commonly happening in this kinds of stars in the sky is basically what all stars do, convert hydrogen to helium therefore releasing a vast amount of energy. The closest stars of this kind are the sun, Sirius and Alpha. Most of the stars that have not passed through the Red Phase are of this kind. These stars have a spherical shape because of the inward and outward forces acting on them. The inward force comes from its internal gravity that pulls all the components of the star towards itself and the outward force comes from the light pressure from the reacting materials in the star.
This is basically the mass that is there before the star is formed. It is a collection of mass that falls from the giant molecular cloud. This stage of star formation lasts for about 100,000 years. As time goes by, they collapse inward due to gravity and then ignition hydrogen to form helium therefore releasing a lot of energy.