84601
By January 1610 , he had sighted the four massive Galilean moons with his 20 × magnification telescope , and he published his results in March 1610 .
 Galilean moons
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:
 Galilean moons