Doppler shift is seen in reverse

The Doppler shift of sound or light waves from a moving source is familiar to physicists and non-physicists alike. Now, researchers in China and Australia have seen the more exotic inverse Doppler effect in light passing through a material made from tiny silicon rods. They say the result could enhance the use of the Doppler effect in all sorts of applications, from astronomy to medicine — via redwolf.newsvine.com