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The Stefan-Boltzmann law dictates that the relatively cool surfaces of red supergiants radiate much less energy per unit area than those of blue supergiants ; thus , for a given luminosity , red supergiants are larger than their blue counterparts .
 person: Stefan-Boltzmann
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Stefan-Boltzmann