Special & General Relativity Questions and Answers
Does light travel at the same speed back and forth along a straight line?
The Michaelson-Morley experiment showed that the propagation of light in any inertial reference frame is completely isotropic. There is no difference in its velocity with respect to its direction of motion.
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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the NASA Astronomy Cafe, part of the NASA Education and Public Outreach program.