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The brave gunmen-astronauts had come out of their retirement with an even more ambitious engineering project : using the recoil of a huge cannon to remove the tilt of the Earth 's axis — so that it would become perpendicular to the planet 's orbit , like Jupiter 's .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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