Doppler Effect Proven by Red Light from Distant Galaxies

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claim: the red light observed from distant galaxies proves they are moving away. (doppler effect right?)
null: because light becomes red diffracting through a medium like space dust or even by gravitation.
sorry if I'm off base or 50years behind, just a general "yes/no" or "get out of my forum you pea-brained biologist" will do .

Roger that. I'm bustin out on this funk.
 
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Space news on Phys.org
Make that 80 years, not 50. :smile:

Tired Light (Wikipedia)
 
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