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by phaemon
1746 days ago
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How do I know that two objects are either receding or approaching? Because it's obvious. Think about it yourself. Edit: ah, wait, your theory says that approaching objects look the same as receding ones. I think you need to justify that. |
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The cosmological redshift is not attributable to galaxies receding.
The cosmological redshift is photons losing energy as they forge a path through the gravitationally connected universe. It's the cost of traveling.
Total redshift = Cosmological redshift (photon forging a path through spacetime) + Doppler redshift (for example, Andromeda drifting toward us) + Gravitational redshift (like how Sun-to-Earth photons are redshifted because the Sun is more massive)