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Does a photon travel more than 1 billion light years in 1 billion years due to the expansion of space?

1125 upvotes • r/askscience
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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?

5 upvotes • r/askscience
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Can G be given an exact definition as easily as c?

3 upvotes • r/askscience
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Should be a quick question. What is the role of the apparatus to an Everettian?

1 upvotes • r/askscience
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Everett's Relative State Formulation and ways to make predictions from a mathematical model

1 upvotes • r/askscience
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Factors for the predicting Tolman's Surface Brightness Test?

1 upvotes • r/askscience
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How to model a measurement being made?

1 upvotes • r/askscience
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Is it a fact the universe is expanding?

1 upvotes • r/askscience
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Why are planets in a planar orbit but dwarf galaxies were not expected to be?

1 upvotes • r/askscience
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Hubble's Length is the maximum distance light can travel, right?

1 upvotes • r/askscience
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