What is the expected main-sequence lifespan established for the Sun, a G-type star?
Answer
About ten billion years
The Sun serves as a crucial baseline when considering stellar longevity, being classified as a G-type star with a relative mass near unity compared to the standard. Its expected main-sequence existence, where it steadily fuses hydrogen in its core, is estimated to be approximately ten billion years. This duration is characteristic of moderately sized stars that balance their fuel supply against a moderate rate of consumption dictated by their core conditions. This moderate pace allows for stellar lives that span billions of years, placing them far above the rapid lives of O and B stars but far below the extreme endurance of Red Dwarfs.
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