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For instance , astronomers in 2019 identified higher-than-expected levels of europium within the star J1124 + 4535 , hypothesizing that this star originated in a dwarf galaxy that collided with the Milky Way billions of years ago .
 location: J1124 + 4535; location: Milky Way
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: J1124 + 4535, Milky Way 
Answer:
 location: J1124 + 4535; location: Milky Way