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blue giant a blue giant is a star with a spectral type of O or B (thus being noticeably blue in appears) fun facts Blue giants are extremely luminous, reaching absolute magnitudes of -5, -6 and even higher. A blue giant is a massive star that has exhausted the hydrogen fuel in its core and left the main sequence. Blue giants have a surface temperature of around 30,000 K Typically, giant stars have radii between 10 and 100 solar radii and luminosities between 10 and 1,000 times that of the sun. so a massive star uses up all the hydrogen fuel. it expands and becomes a red giant. and once the red giant has used up all of that fuel it condenses into a blue giant. life cycle there is a red ring around the star of gas that is being pushed away by the radiation the blue giant emits. blue giants are very big and compact so they burn fuel very quickly. They last about 10,000100,000 years. when they explode they turn in to super novas. Most blue giants are found in O-B associations, large collections of loosely bound young stars. Since they are so hot (but not that dense), their life expectancy is very short (in the order of tens or hundreds of million years), and theories predict that most of them will end their lives as supernovae THE END