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The outer layers of the star are blown off in an explosion triggered by the outward moving supernova shock , known as a Type " II supernova whose displays last days to months .
 astronomical object: Type " II; astronomical object: supernova
Please list all entity words in the text that fit the category.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} 
Answer:
 astronomical object: Type " II; astronomical object: supernova