What is the approximate surface temperature ($ ext{K}$) of our Sun, a yellow dwarf?
Answer
Around $5,778 ext{ K}$
The Sun, classified as a G-type star or yellow dwarf while on the main sequence, possesses a specific surface temperature that acts as a useful reference point for stellar classification. Its surface temperature is established at approximately $5,778$ Kelvin ($ ext{K}$). This temperature is significantly hotter than the red dwarfs, whose surfaces remain below $4,000 ext{ K}$. The Sun’s temperature, combined with its mass and luminosity, places it centrally on the main sequence of the Hertzsprung-Russell diagram, contrasting sharply with the much cooler and dimmer red dwarfs.

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