4495
In the future , helium will continue to accumulate in the core , and in about 5 " billion years this gradual build-up will eventually cause the Sun to exit the main sequence and become a red giant .
 astronomical object: red giant
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: red giant