(August 10, 2017 at 6:37 am)Rhondazvous Wrote: I understand about the rubber band/raisin bread dough analogies. My question is what made scientists look at the universe and say hey, you know what, the galaxies aren't moving. Space is expanding. What tipped them off to make this distinction?
Doppler effect. Pretty much everything we can measure which is outside the local group is showing red shift in its light spectrum over time, meaning it's getting further away.
Urbs Antiqua Fuit Studiisque Asperrima Belli
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