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Talk:Starlight problem (view source)
Revision as of 01:53, January 31, 2012
, 01:53, January 31, 2012→39 billion light years away?: gram
:::::Aschlafly, I'd like to go back to your argument that people claim to have seen stars 39 billion light years away. i did as you suggested and searched Google for ("observable star" "39 billion light years") and got zero hits. Can you please provide me with the reference that I am unable to find? Many thanks.[[User:ScottDG|ScottDG]] [[User talk:ScottDG|Talk]] <b>Is Gingrich an orphan? Conservapedia says yes. Why does nobody else? </b> 20:29, 30 January 2012 (EST)
:::::Aschlafly, I'd like to go back to your argument that people claim to have seen stars 39 billion light years away. i did as you suggested and searched Google for ("observable star" "39 billion light years") and got zero hits. Can you please provide me with the reference that I am unable to find? Many thanks.[[User:ScottDG|ScottDG]] [[User talk:ScottDG|Talk]] <b>Is Gingrich an orphan? Conservapedia says yes. Why does nobody else? </b> 20:29, 30 January 2012 (EST)
::::::No, Rob, they would not. The speed of light is independent of the expansion of the universe, or anything else; that is the principle at the heart of Special Relativity. When we measure something to be 300 light years away, it is 300 light years away. We can use redshift to measure its speed relative to us, but the speed of light is a constant, period. [[User:RachelW|RachelW]] 20:40, 30 January 2012 (EST)
::::::No, Rob, they would not. The speed of light is independent of the expansion of the universe, or anything else; that is the principle at the heart of Special Relativity. When we measure something to be 300 light years away, it is 300 light years away. We can use redshift to measure its speed relative to us, but the speed of light is a constant, period. [[User:RachelW|RachelW]] 20:40, 30 January 2012 (EST)
:::::::So something that is 300 light years away will 300 + whatever the rate of expansion is in x number of years (or light years, whichever is your preferred measurement)? [[User:RobSmith|Rob Smith]] 20:52, 30 January 2012 (EST)
:::::::So something that is 300 light years away will be 300 + whatever the rate of expansion is in x number of years (or light years, whichever is your preferred measurement)? [[User:RobSmith|Rob Smith]] 20:52, 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)
:::::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)
::::::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)