[cripplecreek]

The Doppler effect arises from the relative movement of different objects. But the cosmological red-shift is different because galaxies are stationary in space. Instead, it is space itself that cosmologists think is expanding.

Interesting. I hadn't really considered it that way.

[FredZarguna]

It’s of no consequence whatsoever. Doppler shift requires only differences in relative motion of source and observer. Whether it’s a moving object or moving space makes no difference.

[Fightin Whitey]

Instead, it is space itself that cosmologists think is expanding.

Not in my storage building it's not.

[Cboldt]

“stationary in space” is nonsense. All motion is relative, and the distance between the objects is nothing but that. Some objects close distance - what is that, space shrinking?

[FredZarguna]

A little more to this point: when you consider the Doppler Shift for sound, you must take into account the relative motion of the "space" through which it moves. If two observers are in relative motion and one sends out an audio signal, the Doppler shift will be different if the wind is blowing towards or away from the sound at any appreciable speed. The calculations are in most standard undergraduate physics texts.