76534
A white dwarf star in a close binary system can accumulate material from its companion until it ignites and blows off in a thermonuclear explosion , known as a nova .
 astronomical object: nova
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: nova 
Answer:
 astronomical object: nova