During a star's life, the main sequence portion of its life does not change size appreciably. True.
Because stars are shaped with massive delivers of hydrogen, stars continue to be solid on the main collection for an incredibly long time at a hard and fast length. If a strong star has been magically increased, its gas might cool and the nuclear reactions could decline, reducing the outward pressure.
The primary sequence megastar burns through the hydrogen in its center, accomplishing the end of its existence cycle. At this point, it leaves the principle sequence. Stars smaller than a quarter the mass of the sun disintegrate at once into white dwarfs. White dwarfs now do not burn fusion at their center, but they nonetheless radiate heat.
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