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When the Soviet Union launched the first man into space , Yuri Gagarin in 1961 , they chose a term which anglicizes to " cosmonaut " .
 Soviet Union, Yuri Gagarin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Soviet Union, Yuri Gagarin