If the light waves from a galaxy appear to have shifted towards higher frequency (blue), it is moving towards us, and if they have shifted toward a lower frequency (red), it means the object is moving...If the light waves from a galaxy appear to have shifted towards higher frequency (blue), it is moving towards us, and if they have shifted toward a lower frequency (red), it means the object is moving away. " id="term-2350855" tabindex="0">redshift (weak field approximation, A property of a wave that describes how many wave patterns, or cycles, pass by a point in a given time.
