127800
Gamma-rays in the MeV range are generated in solar flare s ( and even in the Earth 's atmosphere ) , but gamma-rays in the GeV range do not originate in our solar system and are important in the study of extrasolar , and especially extra-galactic astronomy .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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