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Travelling at near-light speed , the journey takes around 28 months for the astronauts , although the effects of relativity mean that 15 years will have elapsed on Earth by the time they reach their destination .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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