compare the surface temperature of a red star with the temperature of a yellow star
The sun has a surface temperature of 5,500 K, typical for a yellow star. Red stars are cooler than the sun, with surface temperatures of 3,500 K for a bright red star and 2,500 K for a dark red star.The hottest stars are blue, with their surface temperatures falling anywhere between 10,000 K and 50,000 K.Stars are fuelled by the nuclear fusion reactions at their core.ed stars are cooler than the sun, with surface temperatures of 3,500 K for a bright red star and 2,500 K for a dark red star. The hottest stars are blue, with their surface temperatures falling anywhere between 10,000 K and 50,000 K. Stars are fuelled by the nuclear fusion reactions at their core.