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If there's nothing to interact with, will the photon attenuate and disappear after some distance, or will it continue to exist and travel forever?

For example, in a hypothetical universe where all matter is within a sphere and spacetime continues outside the sphere without limits, if a photon exits the sphere will it last forever?

For example, in a hypothetical universe where all matter is within a sphere and spacetime continues outside the sphere without limits, if a photon exits the sphere will it last forever?

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