77150
The progenitor was not identified from older images of the galaxy , and is either a type WC Wolf–Rayet star with a mass over 40 times that of the Sun , or a star 20 to 40 times as massive as the Sun in a binary star system .
 Wolf–Rayet star
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:
 Wolf–Rayet star