What is the key difference in cause between Doppler shift and Cosmological redshift?
Answer
Doppler is motion *through* space; Cosmological is the expansion of space itself
Doppler shift relates to relative motion through the backdrop (peculiar velocity), whereas Cosmological redshift is caused by the stretching of the spatial backdrop metric during light travel.
#Videos
Red shift | Astrophysics | Physics | FuseSchool - YouTube
Related Questions
What shift occurs when light wavelengths are stretched toward the longer end of the visible spectrum?For the vast majority of distant galaxies, what is the dominant mechanism causing redshift?What causes cosmological redshift in light from distant galaxies?What does a higher value of the redshift variable ($z$) signify cosmologically?How is the redshift ($z$) mathematically calculated based on wavelength measurements?What is the key difference in cause between Doppler shift and Cosmological redshift?What causes Gravitational Redshift?If a supernova takes 20 days to brighten and fade locally, how long would its cycle appear to take in a galaxy with a redshift of $z=1$?What observational evidence strongly verifies the expansion model over static hypotheses like 'Tired Light'?What phenomenon is described when light waves are compressed due to a source moving toward an observer?What alternative hypothesis suggested photons lose energy over vast distances due to unknown interactions?