**Author:**

Dart, III, Harry P.

**Category:**

Journal Reprints

**Sub-Category:**

Relativity Theory

**Date Published:**

April 1996

**Source Link:**

© Toth-Maatian Review — Dr. T. E. Phipps, Jr. gift

**Keywords:**

Doppler effect, CMBR, velocity addition theorem

**Abstract:**

The cosmic background radiation establishes a fixed frame of reference against which absolute motion can be measured. Relative to that frame, the maximum speed of an object in outer space is the speed of light. Based on that premise a general formula for the Doppler effect is derived which dispenses with the concept of relative speed and the need for Einstein's addition of velocities theorem.

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