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Name the principle by which the motion of galaxies is studied ?

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doppler effect is the one.
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Investigator Physics

Doppler's shift
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Doppler effect
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Physicist at IISc

This is a sweet one. There is no single most used principle astrophysics is a very vast field but for motion newtonian mechanics is good. Then there is special and general relativity. The first proof of Einstein's theory came from a small error in mercury orbit that Newtons laws couldn't predict. The...
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This is a sweet one. There is no single most used principle astrophysics is a very vast field but for motion newtonian mechanics is good. Then there is special and general relativity. The first proof of Einstein's theory came from a small error in mercury orbit that Newtons laws couldn't predict. The correct trajectory came from general relativity. Currently today's what is being used. read less
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biology

Cosmological principle.
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Science master

Heisenberg uncertainty principle
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Math Magician

A single principle can't be used to study all the phenomenon of the huge universe. Earlier, it was Newtonian mechanics. Now, it is basically theory of relativity, both special and general. But it is certainly not confined to them only. Others, like quantum mechanics are used to explain the release of...
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A single principle can't be used to study all the phenomenon of the huge universe. Earlier, it was Newtonian mechanics. Now, it is basically theory of relativity, both special and general. But it is certainly not confined to them only. Others, like quantum mechanics are used to explain the release of various types of radiation by quasars, pulsars and others. Distances calculated using Doppler effect. So, numerous principles. All can't be mentioned here. read less
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