Doppler Effect Red Shift, Blue Shift
Doppler Effect in light waves emitted from a moving star. Animation shows how the apparent increase in frequency observed in light waves emitted from an approaching star (or conversely a decrease in frequency in light waves emitted from a receding star) happens. This causes a red shift for an observer watching the star recede (left of animation) and a blue shift for an observer watching the star approach (right of animation).
Illustration ID: DOPPLER-STAR-red-shift-blue-shift
copyright Russell Kightley
Illustration size: 25.0 Mpixels (71.5 MB uncompressed) - 5000x5000 pixels (16.6x16.6 in / 42.3x42.3 cm at 300 ppi)