80347
Once the Sun stops fusing helium in its core and ejects its layers in a planetary nebula in about 8 " billion years , it will become a white dwarf and , over trillions of years , eventually will no longer emit any light .
 Sun, planetary nebula, white dwarf
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Sun, planetary nebula, white dwarf