Red Shift

When the galaxies or other celestial bodies are moving away, the light waves become stretched out, that is, they become redder. This process is called red shift.

511 Questions
Astronomy
School Subjects
Red Shift

Can there be purple shift aswell as blue shift and red shift?

Redshift and blueshift refer to a change in frequency of light we receive from distant objects (stars, galaxies, etc.) The light can turn different colors, and purple is one of them. However, no matter what the color the light changes to, the technical term is always "redshift" if the frequency of the light decreases (normally indicating that the object is moving away from us), and "blueshift" if it increases (normally indicating that the object is moving towards us).

Blue shift and purple shift would mean the same thing because the spectrum is one-dimensional. It's like if you are in Boston, a shift towards Chicago is the same as a shift towards San Francisco.

Obviously, a purple shift is a super blue shift.

365366367
Red Shift

How is the red shift and blue shift related to the big bang theory?

If a galaxy is red-shifted, the distance us and that galaxy is increasing. If it is blue-shifted, the distance is decreasing.

If the galaxies in our Universe were random in their velocities relative to us, about half of them would be red-shifted and about half would be blue-shifted; and the distance between us and another galaxy would have no effect on the ratio.

But that's not what we see. All galaxies outside our Local Cluster are red-shifted, and we find that the greater the distance between us and a galaxy, the greater the red shift. That the size of the red shift depends on the distance is isotopic in all directions, meaning the distance between us and all other galaxies is increasing at the same ratio based on distance from us.

The BEST explanation of this undeniable fact is that, at some time, space itself (NOT the matter, but space) began to expand, taking matter along for the "ride." IF that hypothesis is correct, we would observe, not only red-shift in all distant galaxies, but other effects. We do indeed see the latter, and exactly as predicted by the Big Bang.

186187188
Red Shift

An observation of the red shift of galaxies suggests that the universe is?

The red shift of galaxies suggests that the universe is expanding in all directions. As the space-time volume between galaxies increases, they seem to move away in all directions and the wavelength of light received is "stretched" meaning a shift in frequency towards the red end of the spectrum.

This forms part of Hubble's law included in Edwin Hubble's paper in 1929

Yes, but it could mean something else. How much energy does the light lose when climbing out of a gravity hole (a large star, for a large distance).

555657
Astronomy
School Subjects
Red Shift

What does the red shift of a galaxy depend on?

The amount of redshift or blueshift of a galaxy depends on how fast it is moving away from us (or towards us).
The only explanation for redshift (on a large scale) that makes sense is that it is the result of the expansion of space itself; i.e., that would be the so-called "cosmological redshift".

293031
Astronomy
School Subjects
Red Shift

The red shifts of distant galaxies show that the universe is?

It tells us that the Universe is expanding.

171819
Red Shift

Red shift data sHow is that galaxies are?

We can't be sure. The only thing we know for sure is that it could be explained as

the speed with which that galaxy is receding from us. If that's actually the cause

of the red shift, then from all the red shifts that we observe, we have to conclude

that all of the distant galaxies are receding from us, and the farther away one is

already, the faster it's receding. If all of that is true, then the whole universe is

expanding. This is the research that made Hubble famous.

Well said, but there is another reason. Maybe the light is coming from a large star (gravity hole, red shift due to gravity).

313233
Red Shift

What does the red shift tell us about the changing universe?

Mainly that the Universe is expanding. Analyzing far-away galaxies, it has recently become clear that the expansion is accelerating - the Universe is now expanding faster than a few billion years ago.

272829
Astronomy
School Subjects
Red Shift

Which is observed most in the universe the red shift or the blue shift?

Redshift, since the Universe is expanding. Only in the case of objects that are relatively nearby will the "proper motion" sometimes dominate, so that some objects actually move towards us.

789
Red Shift

Is the red-shift responsible for the big bang theory?

No, it's the other way round. The Big Bang is responsible for the redshift.

789
Red Shift

Describe the big bang theory and the red shift evidence that supports this theory?

The red shift is a Doppler effect which showed that almost all galaxies are moving away from us (or us from them), and that the farther away a galaxy is the faster it is moving.

Logically, if you "move" backwards in time (a thought experiment only) then it fits that the entire universe occupied a smaller space in the past. By calculation; at about 13.7 billion years ago it occupied only a tiny volume (of space) which must have been very hot and very energetic. The "big bang" (which must have been very small and quite silent) is just a descriptive term.

Or the red shift is due to light escaping from a large star...

272829
Red Shift

Explain what the red shift in the background radiation from the big bang tells us?

Based on numerous theories they said that the universe was created by the big bang.

So based on that theory i will give you your answer.

They said that after the big bang radiant energy have been spread at the end of the universe and it's the snow or hiss that has this static sound when you turn on your TV and there are black and white dots...

I personally believe that the beginning of the universe started a bit differently. But to simplify Hubble's law,it's been said that it got created by something that exploded and spread pieces all around cosmos. Earth moon sun e.t.c are pieces from the original "thing" that exploded and

they say that the universe expands like a shock wave.

Just tried to simplify as much as i could the theory.

This answer doesn't endorse my believes in anyway.

All corrections and new ideas and discussions are more than welcome.

I think the background radiation is different from the Stars' red shift. The Stars' red shift may be due to (1) the Universe moving away from Earth, or (2) from the Universe expanding, or (3) from the fact that stars are "gravity holes" and light escaping from a gravity hole is red shifted. I know the third reason is true.

232425
Astronomy
School Subjects
Red Shift

What does red and red and red make?

If you are using paint then you would just get a big blob of red paint. Or if you are using pencil crayons then it would just look like red. It would look like a solid colour. Or if you are using crayons, then it would be the same thing, and so it would be for the chalk. If you are using it. Either way you just end up with red. The colour only changes if you add another colour. Hope this helps anyone, and if im wrong sorry.

345
Red Shift

The discovery of a red shift in the spectra of galaxies provided evidence that the universe is?

expanding

212223
Astronomy
Big Bang Theory (scientific model)
Red Shift

How does the red-shift of galaxies support the Big Bang Theory?

If everything is moving away, then in the past they must have been closer.

012
Astronomy
Stars
Red Shift

What phenomenon accounts for the blue shift of a star?

The star is moving towards the earth.

012
Red Shift

What are differences in colors of moving objects in space that are approaching and moving objects that are moving away?

Objects moving toward you will have a blue shift in their spectrum and objects moving away from you will have a red shift in their spectrum. This is known as a doppler shift.

181920
Astronomy
School Subjects
Red Shift

What is red shift phenomena?

If you looking for a simple layman answer, then redshifts describes the Doppler effect brought about by an expanding universe. The light sources are moving away from us. Hence the radiation appears red. This is a sure sign that the stars are getting further and further apart from each other and from us.

181920
Red Shift

How can scientists calculate the age of the universe using red shift?

The basic idea is to extrapolate the movement of galaxies into the past: at a certain moment, they were very close together.

181920
Astronomy
Algebra
Red Shift

What does the universe expand into?

I always like the easy questions...! The universe expands into nothing at all. Note that this is different from a vacuum. The universe expands into where there is nothing there. When the universe was created, spacetime, the "construct" in which the universe exists, was created with it. And spacetime is expanding with the universe. Spacetime could be seen as being created on the "wavefront" that is the outer edge of the expanding universe. There!

Of course, we could question whether the Universe is expanding. The evidence is poor. Could be.

171819
Red Shift

How is the universe changing by red shift?

the universe is changing by red shift because when red shift occurs it means that galaxies and stars are moving away from us. this means that the whole universe must be expanding.

111213
Astronomy
School Subjects
Red Shift

What does red shift prove about the galaxies?

The red shift "proves" that the galaxies are attracted by a central force and are in Continuity Condition. The larger the red shift, the larger the central attraction.

The red shift is the cosine of the angle between the velocity and the radius cos(VR). The cosine is max when the the angle is zero or the velocity is parallel to the central radius. The cosine is zero when the angle is 90 degrees or the velocity is perpendicular to the radius with no central attraction.

151617
Astronomy
School Subjects
Red Shift

What does Cosmological red shift mean?

Cosmological redshift is the shift in stellar spectrum due the space within our Universe expanding since the time of the Big Bang. It is isotropic, which could only happen if the Universe were expanding -- if it was spinning apart, the red shift would be different in different directions.

The age of our Universe, as measured by (1) the inverse of the Hubble Constant, (2) the ratio of long-lived isotopes, and (3) the age of the oldest known stars; is all consistent with each other. In addition, "old" galaxies are seen close to us but not far from us -- consistent with a Universe that has a definite beginning.

This interpretation is incorrect in that the universe is not expanding. Hubble data is used as the basis for this interpretation, even though Hubble did not concur or support expansion as the cause of the redshift.

The so-called cosmological redshift is a measure of the centrifugal attraction on the body.

The redshift is basically the ratio of v/c where v is the gravitational velocity of the body and c is the speed of light and v/c=cos(beta) where beta is the angle of the velocity of the body compared to the gravitational radial direction.

This is an unknown principle of nature in that Newton and Einstein did not consider the vector energy in their theories. Energy is a quaternion quantity.

Newton and Einstein only considered the scalar energy Es= -GmM/r and did not consider the vector energy mcV, for a total quaternion energy E= -GmM/r + mcV.

This vector energy is the source of the centrifugal force and makes irrelevant Einstein's "Cosmological Constant" and today's so-called "Dark Energy".

Physics still has not recognized this and clings to the expanding Universe. The Universe is not expanding and the Cosmological redshift is the measure of equilibrium between the centripetal (center seeking) gravitational force and the centrifugal (center fleeing) vector force.

151617
Astronomy
School Subjects
Red Shift

What does red shift of the universe show is us?

universe is expanding at an accelerated rate.

131415
Astronomy
School Subjects
Red Shift

What are the differences between the red shift and blue shift?

A red shift tell us that a object is moving away, while a blue shift tells us an object is moving toward us.

A red shift has a shorter wave length then a blue shift as the red shift is from the red part of the electromagnetic spectrum and vice versa for blue. (blue shift is from the blue (violet) part of the electromagnetic spectrum)

131415
Astronomy
School Subjects
Red Shift

How does a red shift differ from a blue shift?

A red shift tell us that a object is moving away, while a blue shift tells us an object is moving toward us.

Light that has been 'red shifted' has a longer wavelength when it reaches our eyes/telescopes/etc. than it had when it left the object. Light that has been 'blue shifted' now has a shorter wavelength.

The reason stretching the wavelength is known as 'red shifting' is that, in the visible spectrum, red light has the longest wavelength. Blue light has a much shorter wavelength than red so when the wavelength is compressed, we call it blue shifting.

All light can be red/blue shifted to a new wavelength (it doesn't matter on the original color). For instance green light can be red-shifted to yellow light, yellow light can be red-shifted to orange light, orange to red, and red to infra-red (which human eyes can't see).

91011

Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.