Board Thread:General Discussion/@comment-9490823-20141023235024/@comment-9490823-20141025002628

Blaziken rjcf wrote:

Doppler shifts apply to any wave, including sound. Google it. Or just go on Wikipedia, if you want the gist of it.

If you understood more about Doppler shifts, you'd know why you were wrong.

Obviously Doppler shifts in sound only occur in an atmosphere, but they do occur. Surely you've heard the sound a car's engine/ambulance's siren makes when it speeds past you. Blueshift and redshift the topic of this thread, is strictly referring to light, EM radiation. Sound's Doppler Affect has no part in cosmology whatsoever, and is never used. Maybe if you weren't still a student, you'd understand that.