337125
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 .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None