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There is a planetary system orbiting a pulsar ( PSR " B1620 − 26 ) that belongs to the globular cluster M " 4 , but these planets likely formed after the event that created the pulsar .
 pulsar, PSR " B1620 − 26, M " 4
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:
 pulsar, PSR " B1620 − 26, M " 4