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While spectroscopic features can help to distinguish between low mass stars and brown dwarfs , it is often necessary to estimate the mass to come to a conclusion .
 low mass stars
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:
 low mass stars