By measuring the amount of the shift to the red, we can determine that the bright galaxy is moving away at 3,000 km/sec, which is 1 percent of the speed of light, because its lines are shifted in wavelength by ... It is also not the 285,254 km/sec given by the special relativistic Doppler formula 1+z = sqrt((1+v/c)/(1-v/c)).
www.astro.ucla.edu/~wright/doppler.htm www.astro.ucla.edu/~wright/doppler.htm
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Wavelength shift for moving objects. ... The wavelength of light emitted by a moving object is shifted. This effect is called the doppler shift. ... Use of the Doppler shift in astronomy...
zebu.uoregon.edu/~soper/Light/doppler.html zebu.uoregon.edu/~soper/Light/doppler.html
This is an example of what is called the Doppler shift, and it is an effect that is associated with any wave phenomena (such as sound waves). It is the same effect that Hubble used to measure the velocities of distant galaxies.
imagine.gsfc.nasa.gov/YBA/M31-velocity/Doppler-shift-2.... imagine.gsfc.nasa.gov/YBA/M31-velocity/Doppler-shift-2.html
The apparent shift of light toward the red when the emission source is moving away from us, or toward the blue when the emitter is moving toward us, is called the Doppler shift. Let us take a minute to try to explain what this is.
imagine.gsfc.nasa.gov/docs/ask_astro/answers/961029a.ht... imagine.gsfc.nasa.gov/docs/ask_astro/answers/961029a.html
Doppler effect - Wikipedia, the free encyclopedia
Source
The Doppler effect (or Doppler shift ), named after Austrian physicist Christian Doppler who proposed it in 1842, is the change in frequency of a wave for an observer moving relative to the source...
en.wikipedia.org/wiki/Doppler_effect
You hear the effect of a Doppler shift in frequency every time a car goes by. But what happens to produce a sonic boom when a fast jet goes by? This short exercise below will shed some light on the idea (yes! Doppler works for light too!).
webphysics.davidson.edu/Applets/Examples_From_Others/do... webphysics.davidson.edu/Applets/Examples_From_Others/doppler.html
Vary the velocity and notice the wavelength shift ahead of and behind the source. A shock wave, i.e., sonic boom, can be seen to form if the speed of the source is comparable to the phase velocity ... Doppler Physlet...
webphysics.davidson.edu/Applets/Doppler/Doppler.html webphysics.davidson.edu/Applets/Doppler/Doppler.html
For historical reasons, some older text books present two different versions of the Doppler shift equations, one for acoustic phenomena based on traditional Newtonian kinematics, and another for optical and electromagnetic phenomena based on relativistic kinematics.  This sometimes gives the impression that...
www.mathpages.com/rr/s2-04/2-04.htm
A complete understanding of the red-shift of light from receding galaxies and the blue-shift of light from approaching galaxies requires some understanding of relativity, but as long as we view everything from the standpoint of a "stationary" observer we should be all right.
www.7stones.com/Homepage/Publisher/Dopp.html
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