393584
Theories Astronomy According to Parks , the hypothetical Planet X is actually an extinct sun , a brown dwarf star tied to a group of comet s. It would reach a weight of 56 % of that of the Sun .
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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:
 None