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 ...
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Chinese scientists create a ghost radar moving at ‘near-light-speed’ to detect submarinesResearchers in China have harnessed the power of the Doppler effect ... For an observer on Earth, the wavelength of these electromagnetic waves, emitted by a source moving away at such high ...
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