/u/mobydikc's posts in /r/askscience
Does a photon travel more than 1 billion light years in 1 billion years due to the expansion of space?
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The CMB has a peak energy of 0.0006626 eV when it reaches us after redshifting for about 14 billion years. What's the initial energy of such a photon, almost 14 billion years ago?
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