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The brightest of the globular clusters , sixth magnitude NGC 6397 , lies at a distance of just , making it one of the closest globular clusters to the Solar System .
 NGC 6397, Solar System
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 NGC 6397, Solar System