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In our modern view of the expansion of the universe, we understand that it is space that is stretching; individual galaxies don't speed away from each other as if they were rockets. In that case, why do
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In our modern view of the expansion of the universe, we understand that it is space that is stretching; individual galaxies don't speed away from each other as if they were rockets. In that case, why do galaxies show a redshift?

User Alice Wonder
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Answer:

as space stretches, the waves of radiation in space also stretch and their wavelength increases

Step-by-step explanation:

User Burt Beckwith
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