The Doppler effect, named for Christian Doppler, states that an observer senses a change in frequency of a moving wave source ...

Recently, astronomers have been puzzled by an unknown type of cosmic radio signal. A new breakthrough has finally traced one of them.

Researchers in China have harnessed the power of the Doppler effect to achieve a breakthrough ... emitted by a source moving ...

Determining something's radial velocity—how fast it is moving towards or away from you—is quite easy. By taking note of something called the Doppler effect and making close observations of the ...