Special & General Relativity Questions and Answers
Do radio waves get red shifted?
All electromagnetic radiation, no matter what its wavelength, are affected the exactly the same way by both the cosmological redshift and the special relativistic Doppler shift. You would have to tune your receiver to a longer wavelength to pick up the red shifted signal.
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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.