But did you know that light from an object traveling at high speeds changes color? This is thanks to what's called the Doppler effect—the way speed affects the length of waves, such as sound or ...

The expanding Universe The Doppler effect causes shifts in wavelengths of sound and light. Cosmic microwave background radiation as evidence for the Big Bang and expansion of the Universe.

By comparing the light ... Doppler equation used for sound calculations cannot be used in this situation. This is because galaxies are receding (moving away) at such high speeds that relativistic ...