How long is the Sun's stable hydrogen-burning main sequence expected to last?
Answer
Another five billion years
The Sun has currently spent approximately 4.6 billion years in its stable phase. Astronomers estimate that this steady consumption of hydrogen fuel in the core, characteristic of the main sequence phase for a G-type star, will continue for an additional five billion years. Although some models suggest slightly longer durations, the prevailing scientific consensus centers on a half-decade-long countdown until the core exhausts its hydrogen supply and the star transitions out of this predictable era.
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