On a Hertzprung Russel diagram the main sequence is the relationship between absolute magnitude and the temperature of the star.
Ninety percent of stars are main sequence stars....
Our very own star is a main sequence star..........
The sun will become a Red Giant in about 4 billion years
The HR diagram shows the stars from hottest to coldest from left to right. The brighter the star the higher up it is on the graph. The stars not in the line from left to right are not apart of the main sequence.
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