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→‎39 billion light years away?: Please explain how you would test that "fact".
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As to the scientific question, there is a logical circularity in claims of how far light has traveled before seen on Earth.  Assumptions need to be set forth more clearly, as Rob was pointing out.--[[User:Aschlafly|Andy Schlafly]] 20:14, 30 January 2012 (EST)
 
As to the scientific question, there is a logical circularity in claims of how far light has traveled before seen on Earth.  Assumptions need to be set forth more clearly, as Rob was pointing out.--[[User:Aschlafly|Andy Schlafly]] 20:14, 30 January 2012 (EST)
 
:A constant speed of light is not an assumption: it's a fact. --[[User:GeorgeLi|GeorgeLi]] 20:17, 30 January 2012 (EST)
 
:A constant speed of light is not an assumption: it's a fact. --[[User:GeorgeLi|GeorgeLi]] 20:17, 30 January 2012 (EST)
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::Please explain how you would test that "fact".--[[User:Aschlafly|Andy Schlafly]] 20:24, 30 January 2012 (EST)
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