What is the primary difference between Doppler Redshift and Cosmological Redshift?
Answer
Doppler Redshift happens because objects move through space, while Cosmological Redshift happens because the fabric of space itself is stretching.
While both phenomena result in the stretching of light waves, their mechanisms are distinct. Doppler Redshift is caused by the physical motion of an object traversing through space. In contrast, Cosmological Redshift occurs because space itself is expanding, effectively carrying galaxies along with it. Despite these different underlying causes, both result in the same observable outcome: light is shifted toward the red end of the spectrum.
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