Life cycle Of Stars
By Brennan Carson
The origin of elements
Approximately 73% of the mass of the visible universe is in the form of hydrogen. Helium makes up about 25% of the mass, and everything else represents only 2%. The low-mass elements, hydrogen and helium, were produced in the hot, dense conditions of the birth of the universe itself.
The main sequence is the first stage of the journey that a star goes through. the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell. Our sun Is currently in the main sequence
This is the second stage of the star. The energy produced by the helium fusion causes the star to expand outward to many times its original size. Red giant stars reach sizes of 100 million to 1 billion kilometers in diameter (62 million to 621 million miles), 100 to 1,000 times the size of the sun
This is the third and final stop for a star.
White dwarfs are stars that have burned up all of the hydrogen they once used as nuclear fuel. Fusion in a star's core produces heat and outward pressure, but this pressure is kept in balance by the inward push of gravity generated by a star's mass.