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Talk:Starlight problem (view source)
Revision as of 01:50, January 31, 2012
, 01:50, January 31, 2012→39 billion light years away?
:::::George, in other words, you don't have a test for your assertion that the speed of light must have always been constant is a "fact". If there is no test, then it is not a scientific "fact".--[[User:Aschlafly|Andy Schlafly]] 20:47, 30 January 2012 (EST)
:::::George, in other words, you don't have a test for your assertion that the speed of light must have always been constant is a "fact". If there is no test, then it is not a scientific "fact".--[[User:Aschlafly|Andy Schlafly]] 20:47, 30 January 2012 (EST)
::::::There is a test, a very simple one - take repeated measurements of the speed of light and see if it varies by more than the error bars of the measuring apparatus. That's been done and it never does. However the test isn't necessary because, thanks to E=mc<sup>2</sup>, the speed of light ''can't'' change. --[[User:GeorgeLi|GeorgeLi]] 20:50, 30 January 2012 (EST)