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In 1989 , the Voyager 2 spacecraft observed cryovolcanoes ( ice volcanoes ) on Triton , a moon of Neptune , and in 2005 the Cassini–Huygens probe photographed fountains of frozen particles erupting from Enceladus , a moon of Saturn .
 Triton, Neptune, Cassini–Huygens, Enceladus, Saturn
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Triton, Neptune, Cassini–Huygens, Enceladus, Saturn