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These stars can range from around a tenth of the mass of our Sun all the way up to 200 times as massive, and how long a star will stay in the main sequence phase depends on its size,The star is only stable because the light pressure of this energy balances out the star’s gravitational collapse.

Approximately nine out of ten stars in the universe are main stars.

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Once such a large amount of gas and dust huddle together, they form what we call a protostar or our Sun, and stars of the same mass, the protostar phase would have ended after approximately 100,000 years. If the star is big enough to fuse hydrogen atoms into helium, it will enter the phase that our Sun is in, called the main sequence phase

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begins when a dense region in a nebula begins to shrink and warm up, one of several events that may occur to initiate the gravitational collapse of a molecular cloud.It would take a collection of gas and dust a hundred times the size of our solar system

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Stars are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. Star depends very much on its size, is on the main sequence stage of its life.