Abstract
A simple, global picture of photon exchange in the flat, matter-dominated universe is presented using relativistic cosmology. Equations for the photon’s recessional velocity and position relative to the receiver are derived. The results are discussed in the context of the ‘‘raisin bread universe.’’ Contrary to intuition, it is shown that the Hubble recessional velocity of the emitter can exceed the speed of light for sources within the particle horizon of the receiver. The model used to obtain these results can be used by introductory astronomy students to obtain the proper distance and the time-of-flight distance to sources with large redshifts.
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