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In the early part of the twentieth century, Slipher, Hubble and others made the first measurements of the redshifts and blue shifts of galaxies beyond the Milky Way. They initially interpreted these redshifts and blue shifts as due solely to the Doppler effect, but later Hubble discovered a rough correlation between the increasing redshifts and the increasing distance of galaxies. Theorists almost immediately realized that these observations could be explained by a different mechanism for producing redshifts. Hubble's law of the correlation between redshifts and distances is required by models of cosmology derived from general relativity that have a metric expansion of space. As a result, photons propagating through the expanding space are stretched, creating the cosmological redshift.
Originally posted by squiz
I recognize the tactics, finicky nitpicking of semantics, an act of frustration.
You are an angry dinosaur aren't you? Just kidding.
Nice try brother, amen.
Originally posted by Astyanax
Mathematics, actuallly, not semantics. Don't forget I agreed with you: red shift does not equate to distance from the observer. But when you have factored out the other causes of red shift in ridiculously faraway astronomical bodies, you are left with a correlation between distance and degree of shift. A correlation, not an equivalence.