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Therefore, for the exact same reason our "observable" universe is limited by the travel distance of photons since the CMB, our local gravitational potential shifts over time for the same reason. It's true that the gravitational field at a spacetime point is due to the matter on the past light cone of that point, but that's automatically taken into ...


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The pulsars are moving relative to you. If you go to a different spot in the galaxy then the relative velocity will change (assuming you are at rest in some galactocentric frame). i.e. There will be a different angle between the pulsar velocity vector and the line between you and the pulsar and hence there will be a change in the pulsar Doppler shift, ...


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