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In October 2018 , NASA-funded researchers found that lengthy journeys into outer space , including travel to the planet Mars , may substantially damage the gastrointestinal tissues of astronauts .
 NASA-funded, Mars
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 NASA-funded, Mars