How much cooler is the surface temperature of UY Scuti compared to the Sun's $5,226^ ext{^ m o} ext{C}$?
Answer
Nearly $40$ percent cooler
UY Scuti exhibits a surface temperature around $3,092^ ext{^ m o} ext{C}$ ($1,700^ ext{^ m o} ext{F}$). In contrast, the Sun's surface temperature is listed at $5,226^ ext{^ m o} ext{C}$. The difference between these two temperatures indicates that the red supergiant is substantially cooler than our local star. Specifically, the text notes that UY Scuti's surface temperature is nearly $40$ percent cooler than that of the Sun. This lower temperature is intrinsically linked to its evolutionary stage, as massive stars cool significantly as they expand late in their life cycle before collapse.
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