Molecular CloudsĪ Molecular Cloud is a large region of gas and dust that could stretch for light years. There are three pre-stages and generally all stars will go through these stages. These are the stages in the life of the star which has not yet become a main sequence, one which is fusing hydrogen into helium. Betelgeuse is a post-Main Sequence star example.Larger, hotters stars are inefficient and will run out of hydrogen in millions rather than billions of years.Proxima Centauri, a Red Dwarf will possibly last for trillions rather than billions of years. Smaller Main Sequence stars are more efficient at fusing hydrogen and will last longer than larger stars such as the Sun.It is at this point when life will no longer be able to survive on Earth and will need to move to another planet to survive. It is expected to begin moving out of the Main Sequence in a billion years when it begins expanding and eventually consuming the planets. The Sun is in a Main Sequence Star as it is fusing its supply of hydrogen into helium.When the outward pressures grow, the star will become a red giant star and become cooler.
During this Main Sequence phase, the inward and outward pressures are in equilibrium but once it moves out of the Main Sequence, the outward pressures exceed the inward pressures causing the star to grow.Main Sequence stars are often referred to as dwarf stars,.Once a star has finished fusing hydrogen into helium, it begins fusing helium into either carbon or oxygen.When a star is referred to as a Dwarf Star, it usually refers to a Main Sequence star.
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