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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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Tutor

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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Related Questions

The current in a circuit follows the relation i = 100sin?t. If frequency is 25 Hz, how long will it take for the current to rise to 50 A ? a.) 1 ms. b.) 3.33 ms. c.) 10 ms. d.) 20 ms.
i= sin wt f= 25 HZ w= 2×pi×f t=? 50=100 sin wt 50=100 sin (2×180×25) t 50/100= sin 9000 t 1/2=sin 9000 t Sin-' (1/2)= 9000t sin -' (1/2)=30 30= 9000 t t = 30/9000 t = 1/300 = 3.33 ms.
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Name any one 10 million population city of India.
The largest city in India is Mumbai, with a population of 12,691,836 people. Delhi has a rich history that dates back to 6th Century BCE. 10,927,986.
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