What is a main sequence star?
The main-sequence star is the second stage of a star. This is the stage where a star will remain most of its life. The sun if an example of a main-sequence star. Over millions of years the stars size slowly begins to get smaller because of the heat and energy it is losing. The stars temperature, density, and pressure at the core continuously increase. Why does the temperature rise? The temperature inside the star continues to rise because the star radiates away energy. The gravity pulling in and the gas pressure pushing out will happen for the stars life span.
How is the star formed?
The main sequence star begins when the nebula collapses and turns into a protostar. The protostar reaches 10 million degrees it creates nuclear energy. As energy is formed pressure builds up inside the protostar. The pressure creates photons; this causes gravity inside the main sequence. The productions of photons finally end and it’s the beginning of the main sequences life.
What goes on inside?
Main sequence stars take part in nuclear fusion, the process of turning the element hydrogen into helium.
The equation for hydrogen turning into helium is: 2H + 1H -> 3He + energy
The equation for hydrogen turning into helium is: 2H + 1H -> 3He + energy