High mass stars are incredibly hot, with surface temperatures ranging from 25,000 to 50,000 Kelvin (K). That's about 44,500 to 89,500 degrees Fahrenheit!

Here's a breakdown:

* Surface Temperature: The surface temperature of a high mass star is significantly higher than that of our Sun, which is about 5,500 K. This extreme heat is due to the intense nuclear fusion reactions occurring within the star's core.

* Core Temperature: The core of a high mass star is even hotter, reaching millions of Kelvin. This extreme temperature is necessary to sustain the fusion of heavier elements, such as carbon and oxygen.

The temperature of a high mass star is directly related to its mass. The more massive the star, the stronger its gravity, which leads to higher pressure and temperature in the core. This higher temperature allows for fusion reactions to occur at a faster rate, releasing more energy and resulting in a hotter surface.