What is the approximate minimum surface temperature threshold for stars classified as Blue?
Answer
Exceeding 25,000 Kelvin.
Blue stars represent the extreme upper limit of the stellar temperature scale among visible stars. They are described as the hottest stars known because their surface temperatures must surpass a very high threshold to achieve peak emission in the shortest, highest-energy visible wavelengths. This specific benchmark is set at temperatures greater than 25,000 Kelvin. Stars that are slightly cooler, falling between 10,000 K and 25,000 K, are grouped separately as Blue-White stars. The intensely high temperatures of the Blue class are sustained by massive stars consuming their fuel rapidly.
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