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One of the most important solar missions to date has been the Solar and Heliospheric Observatory , jointly built by the European Space Agency and NASA and launched on 2 December 1995 .
 Solar and Heliospheric Observatory, European Space Agency, NASA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Solar and Heliospheric Observatory, European Space Agency, NASA