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Physics, Astronomy & Cosmology / stretching sunlight question
« on: 05/10/2003 00:36:33 »
To quote Schroeder, and in reference to Einstein's theory: "Waves of sunlight reaching Earth are stretched longer by 2.12 parts in a million relative to similar light waves generated on Earth."
I am not debating that truth. I was just wondering if somebody could give me, or guide me to, some information that could explain how we know that those waves are actually stretched? In other words; how do we know the Sun didn't just give off light with that frequency?
I am not debating that truth. I was just wondering if somebody could give me, or guide me to, some information that could explain how we know that those waves are actually stretched? In other words; how do we know the Sun didn't just give off light with that frequency?
