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Astronomy and Cosmology
Astronomy and Astrophysics
Red shift / Blue Shift - Gravity Well Roundtrip
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[QUOTE="Bandersnatch, post: 6399324, member: 399360"] Yes. The photon gains just as much energy falling into a gravity well as it later loses climbing out of it. The picture changes with large structures under certain kinds of expansion, where gravity wells evolve during a photon's journey (the Sachs-Wolfe effect). But in the simplest scenario it's just energy conservation. [/QUOTE]
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Astronomy and Cosmology
Astronomy and Astrophysics
Red shift / Blue Shift - Gravity Well Roundtrip
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