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You 'll recall December of 1998 , I should say , the Mars Polar Lander had a very unsuccessful conclusion to its flight to the Red Planet , which was part of a disasterous Mars season .
 1998, the Mars Polar Lander, the Red Planet, Mars, season
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 1998, the Mars Polar Lander, the Red Planet, Mars, season