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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.
221 Questions
Does your universe have a red or blue shift?
Speaking generally, most objects in the universe are red-shifted, that is they appear to be moving away from us. There are exceptions to this, obviously. There are plenty of objects in our own galaxy that appear to moving towards us. Plus the Andromeda galaxy appears to be on a collision course with the Milky Way. Objects moving towards us would appear to be blue-shifted.
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.
What does it mean when the color of an object in the universe shifts toward red?
When the color of an object in the universe shifts towards red, it indicates that the object is moving away from the observer. This phenomenon, known as redshift, is caused by the expansion of the universe and the stretching of light waves as they travel through expanding space.
Can red shift and blue shift exist on the same object at the same time?
Yes, if the object is spinning there will be red shifts on the half moving away and blue shifts on the half moving closer.
This is one way tornadoes are detected using Doppler RADAR, the water droplets on one side of the cloud are moving away (red shift) while those on the other side are moving closer (blue shift), showing that the cloud is rotating.
Solid spinning objects act the same and the rotation is detectable with Doppler RADAR.
What are red shift and blue shift in UV spectroscopy?
The solvent in which the absorbing species is dissolved also has an effect on the spectrum of the species. Peaks resulting from n ® p* transitions are shifted to shorter wavelengths (blue shift) with increasing solvent polarity. This arises from increased solvation of the lone pair, which lowers the energy of the n orbital. Often (but not always), the reverse (i.e. red shift) is seen for p ® p* transitions. This is caused by attractive polarisation forces between the solvent and the absorber, which lower the energy levels of both the excited and unexcited states. This effect is greater for the excited state, and so the energy difference between the excited and unexcited states is slightly reduced - resulting in a small red shift. This effect also influences n ® p* transitions but is overshadowed by the blue shift resulting from solvation of lone pairs.
How are blue shift and red shift the same?
Light received by an observer is affected if the observer or the source are moving towards or away from one another. This is the Doppler Effect.
This is sort of like a race car.
As it's approaching you, its noise sounds higher in pitch, and lower in pitch as it's moving away from you.
Light waves - just like sound waves - are affected by relative movement between the observer and source.
When the observer is moving away from the light source, the light is shifted to the red end of the light spectrum. The light waves are "stretched". There is further between the peaks of the wave.
So, the wavelength increases. That means a shift from blue to red in the spectrum.
By convention, the shift towards longer wavelengths is called a redshift.
In fact, red light could be shifted to infrared.
"Redshift" just means a change in the observed light towards longer wavelengths.
When the observer is moving towards the light source, th light shifts to the blue end of the light spectrum. We call that a blueshift.
Redshifts can also be caused by the effect of gravity.
Answer2:
Redshift by gravity is F =mGM/r2= vp/r
vp/r=vp/ct=(v/c)p/t = (v/c)mv/t = (v/c)ma.
Gravity creates the velocity v and v/c is the "redshift" due to gravity v and not due to universe expansion of the recession of the body. The redshift of the earth is v/c = 30k/300M = 1/10k.
What does the red shift of a galaxy depend on?
Answer 1
Most galaxies are too far away for us to record the spectrum of a single star. So the spectrum of whole galaxy is recorded. Now enough of these spectra has been recorded to show that all were shifted towards the red, otherwise known as redshift. The phenomena of Doppler effect is such that if an emitter or source is moving away from the observer, the spectral lines are shifted towards the red end. Because of the observed redshift, all the galaxies appear to be going away from us. Also, we see that the farther away a galaxy is, the faster it is moving from us. And once it was realized that the relationship held for all galaxies whose distance was known, the amount of the redshift was used to determine the distance to a galaxy.
Answer 2
Consider that the redshift is telling us that the high redshift galaxies are closer to their gravitational centers where gravity is stronger and the ratio v/c is greater. Mercury has v/c higher than earth, v2/c2 = GM/rc2 . Consider that light slows down in gravity "medium". Consider mv2/r = mv/t (v/c) = ma (v/c).
The redshift does not mean the Universe is expanding, it means rather the Universe is in equilibrium. The redshift is the centrifugal acceleration balancing the gravitational centripetal acceleration.
Redshift = z = the percent change of wavelength = the speed v/c ratio = the cosine of the angle between the velocity and radius to the center of potential energy, gravity or electrical. Thus cos(p) = z = v/c = delta wavelength/wavelength. The closer the bodies is to the gravitational center, the larger the speed v and the larger the redshift and the smaller the angle (p) and the larger the cos(p). The redshift is zero when the velocity is perpendicular to the radius.
Hubble did not agree with the expansion idea and thought that the redshift was an "hitherto unknown principle of nature". The redshift is due to the conservation of energy:E= - mGM/r + mcv giving in the Continuity Equation :
GM/r^2 = cDel.v = (cv/r)cos(p) giving cos(p) = v/c = z.
There is further confusion about the redshift, the centrifugal force cmDel.v is center-fleeing behavior. The deflection is away from the gravity center not towards the gravity center. This redshift is related to the "dark energy" , Momentum Energy, cP, from moving masses. The Earth has redshift z=30k/300M . Is the Earth expanding from the Sun? No the Earth is in Equilibrium with the sun at center and has centrifugal force mcDel.v.
What information did scientists gain from measuring the red shift of stars or galaxies?
Measurement of the red shift makes it possible to determine how quickly an astronomical object is moving away from the Earth. The overall picture of how many different objects are moving helps us to understand the expansion of the universe as a whole.
A shift give, often referred to in the context of work or scheduling, is a type of benefit or incentive provided by employers to encourage employees to take on less desirable shifts or additional hours. This can include bonuses, increased pay rates, or other perks for working during peak times or inconvenient hours. It aims to enhance workforce flexibility and ensure adequate staffing during critical periods.
What does refreshing indicate to astronomers?
I don't think that "refreshing" is a common term in astronomy. If you mean "redshift", please ask a separate question.
No One can shape shift IRL. Unless you count weight loss/weight gain.
In the universe what is the red shift?
The alterations to the electromagnetic spectrum caused by the expansion of the universe.
What is a red shift and what does it mean for a star?
It's a change (decrease) in the frequency of the light we receive from the star. Equivalently, an increase in the wavelength. It usually means the star is moving away from us, though it might also be caused (usually to a lesser extent) by the star's gravitation.
Does a red shift means that are moving closer to earth?
No. A red shift indicates that the object is moving away from the earth.
What can the Doppler effect tell us about in astronomy?
It can tell us whether a star, or a galaxy, is moving towards us or away from us.
The red shift shows the velocity with which an object is moving away from the earth. The red shift of an object is correlated to its distance from the earth and so it is also a measure of the distance.
What are the difference between red shift and blue shift?
The frequency of light from a star is reduced (its wavelength increased) when the star is moving away from the observer. Red light has longer wavelengths than blue light. So the light from a star which is moving away from the earth appears to be redder than it actually was. This phenomenon is similar to the pitch of an ambulance siren dropping as it passes you and is moving away. The true spectrum for light from a star depends on the temperature of the star, but there are characteristic absorption lines (dark lines) in the spectrum which are specific to chemical elements which are present in the outer regions of the stars - such as hydrogen and helium. Light from within the star is absorbed by the atoms of these elements when they move from a low-energy state to one with a higher energy level. A comparison of where in the spectrum these lines appear to be against where they should be (for a stationary) star are a measure of the red-shift (or blue shift).
A red shift is observed if an object is moving away from the earth while a blue shift is observed if it is approaching the earth.
How is the red shift evidence for the big bang theory?
Briefly, redshift shows that most objects move away from us; this means that the Universe is expanding.
Red shift occurs when an object is moving away from the observer.
