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The most recent directly observed supernova in the Milky Way was Kepler 's Supernova in 1604 , but the remnants of more recent supernovae have been found .
 astronomical object: Milky Way; astronomical object: Kepler 's Supernova
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Milky Way, Kepler 's Supernova 
Answer:
 astronomical object: Milky Way; astronomical object: Kepler 's Supernova