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essentialsaltes -> RE: There where more than two creations (5/7/2008 5:47:27 PM)
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quote:
I'm not one to typically stick my nose into such things, but if the question is whether the speed of light has always been constant since the inception of the universe, how would we know that with certainty through current observations? As Method has mentioned, current observations are of 'old' light. People have looked for variations in the fine-structure constant, "alpha", which indicates the strength of electromagnetism and involves the speed of light. Looking at distant quasars, it looks like the constant has changed no more than 0.001% over the last 10-12 billion years. If you keep alpha fixed by changing the speed of light but vary the other constants that make up alpha to offset that change, things get even worse. The spectral lines of the elements would change, but since we can do spectroscopy on distant objects just fine, that isn't the case.
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