UY Scuti is a red supergiant, and while it's famous for its immense size, it's not actually the hottest star. Its surface temperature is estimated to be around 3,365°C (6,090°F).

Here's a comparison:

* UY Scuti: 3,365°C (6,090°F)

* Our Sun: 5,500°C (9,932°F)

* Sirius (the brightest star in the night sky): 9,940°C (17,920°F)

* The hottest known stars (like WR 102): Over 100,000°C (180,000°F)

While UY Scuti is enormous, its surface temperature is relatively cool. The hottest stars in the universe are much smaller and denser but have temperatures that dwarf even our own Sun.

It's important to remember that "hot" is a relative term. Even though UY Scuti is cooler than many stars, it's still incredibly hot!