What is the approximate main-sequence duration for a star similar to our Sun ($1 M_{ ext{odot}}$)?
Answer
10 billion years
Stars that have a mass comparable to our own Sun, denoted as 1 solar mass ($1 M_{ ext{odot}}$), possess a relatively stable and long main-sequence lifetime when compared to their more massive counterparts. The estimated duration for a Sun-like star to sustain core hydrogen fusion before exhausting its central supply is fixed at approximately 10 billion years. This lifespan serves as a crucial benchmark in astrophysics for assessing stellar ages. Furthermore, the text indicates that our Sun is currently middle-aged within this timeframe, having already expended about 4.6 billion years of its predicted main-sequence existence.
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