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The first confirmed discovery of an extrasolar planet orbiting an ordinary main-sequence star occurred on 6 October 1995 , when Michel Mayor and Didier Queloz of the University of Geneva announced the detection of an exoplanet around 51 Pegasi .
 Michel Mayor, Didier Queloz, University of Geneva, 51 Pegasi
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:
 Michel Mayor, Didier Queloz, University of Geneva, 51 Pegasi