As an expert in the field of astronomy, I can tell you that the concept of the "hottest" star can be a bit complex, as it depends on the criteria we're using to define "hottest." In terms of surface temperature, the hottest known stars are typically very massive and luminous, often referred to as O-type stars. These stars can have surface temperatures exceeding 30,000 Kelvin (53,540 degrees Fahrenheit or 30,732 degrees Celsius).

However, there are even hotter stars in terms of core temperature, where nuclear fusion occurs. The temperatures in the cores of these stars can reach millions of degrees Kelvin. One of the hottest known stars in terms of core temperature is the Wolf-Rayet star WR 102ka, which has a core temperature estimated to be around 200 million Kelvin (359,540,000 degrees Fahrenheit or 200,932,000 degrees Celsius).

It's important to note that the hottest stars are also among the shortest-lived, as they burn through their nuclear fuel at an incredibly fast rate.

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You can tell the temperature of a star by looking at its color. The coolest stars are red, then orange, then yellow. Even hotter stars are white and then the hottest stars are blue! The surface temperature of our sun is 5777 Kelvin.read more >>