Red Shift

Usually, that the object is moving away from us. It may also mean that the light comes from a "gravitational well", that is, that the light has to escape from gravity before it reaches us - this will make the light lose some energy, and shift towards the red part of the spectrum.

Redshift is the phenomenon where light from distant celestial objects is shifted toward the red end of the spectrum, indicating that these objects are moving away from us. This effect is primarily associated with the Doppler effect, which describes how the wavelength of light changes due to the relative motion of the source and the observer. Redshift is a key piece of evidence for the Big Bang theory, as it supports the idea that the universe is expanding, with distant galaxies receding from us over time.

Generally, the galaxies that are further away will have the larger red shifts.

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Red shift does not support the steady state theory.

The light spectrum can be viewed as a slinky. When compressed, the light waves change to the blue end of the spectrum. When stretched, the the light changes to the red end of the spectrum. Physicists know that our universe is expanding because galaxies further away change to the red end of the spectrum. This means the galaxies were once closer together in the past than what they are now. This is one of the many pieces of evidence that supports the Big Bang Theory.

It is difficult to estimate the distance of astronomical objects without information about its intrinsic brightness. However, its spectrum will contain absorption lines based on elements, such as hydrogen and helium, in the outer regions of the object. This lines are characteristic of the elements and they are also red-shifted which allows the red shift to be measured more readily. The red shift is a measure of how fast the object is receding from the earth and, because the red shift is correlated with the distance from the earth, it provides a relatively simple guide to the distance of the object.

Jesuit priest George LeMaitre first proposed the idea that the space of our Universe is expanding, and has been doing so since (his words) "the day with no yesterday." If his idea is correct, then we would see all galaxies outside our Local Group as red shifted, and the size of that red shift would be proportional to the distance between us and those distant galaxies. This undeniable fact about our Universe -- called the Cosmological (or Hubble) Red Shift -- is exactly what we do see.

The spectrum of light emitted from heated hydrogen has dark lines, caused by the absorption of a very narrow wavelength band of light. These dark lines always take the same location relative to each other. If all the lines in an object's spectrum are shifted by the same amount, towards the red end of the visible spectrum, then the light is "red shifted." The amount of the shift is often described with a number 'z', where z equals the shift in wavelength divided by the wavelength as originally emitted by the object.

No. The red shift simply means that the absorption lines of elements such as hydrogen and helium are shifted towards the red end of the spectrum. A very hot star would normally appear blue. If it were relatively near the earth and so receding relatively slowly, the spectrum would still be blueish, rather than red.

During the time a super-nova in a very distant galaxy emits light, the first photons it emits have a head start over the last such photons -- ie, they begin to leave earlier. As such, there exists a distance between the first photons and the last photons.

If that super-nova occurred over a billion years ago, AND if space is expanding over time, then the distance between the first photons and the last photons will also expand during the billions of years it takes for that distant super-nova to reach us. Because the last photons from a distant super-nova have a greater distance gap than the last photons from a nearby super-nova, distant ones will seem to last longer than nearby ones.

The difference in time between the first photons and the last photons from a distant super-nova, as opposed to those from a nearby super-nova, match perfectly with the expansion in space seen in red-shift.

In addition, if spatial expansion has been (more or less) constant since the earliest moments of our Universe, then at one time our Universe was far more dense than it is now, and that, at some point, the density dropped to the point where protons and electrons would combine into atoms, photons would no longer be absorbed by atoms, such photons would then be free to travel (and expand their wavelength) for billions of years, and we should observe almost perfectly isotropic microwave radiation coming from all parts of the sky. That was predicted in 1946, and observed eighteen years later -- exactly as predicted.

Red shift is observed in the spectrum of light from an object when it is moving away from the observer. Most astronomical objects display a red shift in their light. Also, the red shift is greater for objects which are further away. For this to happen - in all directions, the universe must be expanding.

According to modern cosmology, every point in space should see every other point (on a large scale so point=galaxy) moving away from it as a result of the big bang, and redshift is when light is shifted toward the red end of the spectrum(Captain Obvious reporting for duty!) because the source is rapidly moving away. So redshift of galaxies is an indication of them moving away from us, as predicted by the big bang.

A blue shift is observed in the spectrum from an object approaching the observer whereas a red shift is observed for a receding object.

Red shift is the apparent elongation of the wavelength of light reaching us from distant sources of light due to the expansion of space in between. The amount of red shift can be used to work out the recessional velocity of a galaxy and it's distance from us.

Not much, I'm afraid. The Big Bang was about 14 BILLION years ago; we weren't there, there were no recording devices, and after that long a period, there's precious little real evidence. All of our pronouncements about exactly how the Big Bang progressed, nano-second by nanosecond, are based on tenuous inferences, sketchy data and mathematical models which are not entirely self-consistent.

We can measure the doppler red shift. That's a fact. What causes it? Is the red-shift caused by the speed of distant galaxies receding from us, or could there be a gravitational component? Edwin Hubble said it was because the universe was expanding - but can we be CERTAIN that he was right?

Penzias and Wilson measured the isotropic background microwave radiation. That's a fact. Do we KNOW that this radiation is some sort of echo of the big bang? Or could there be some other cause that we haven't thought of, yet? Yes, it's about what scientists calculated might be the result of a sudden expansion of the universe, but is there no other possible cause?

We humans are still quite new at this cosmology stuff; a hundred years ago, we were just beginning to learn that the atom wasn't an indivisible solid, that there might be smaller particles stuffed in there.

As Tommy Lee Jones says in the original MiB movie, "Imagine what you'll KNOW tomorrow."

Red shift is the doppler effect manifest in light. The doppler effect is why for instance a police siren or a train horn seems higher in pitch while coming towards you, and lower in pitch moving away from you. The red shift effect is the same principle applied to light. If a body emits light, moving towards you it appears to have a "higher pitch", which amounts to what's called blue shift. Moving away, the "pitch" seems lower, amounting to red shift.

It was Edwin Hubble who in 1929 formulated the law about red shift as it relates to bodies in space moving away from us, and thus discovered that the universe spanned beyond our own galaxy. Red (and blue) shift can also be used to find planets around other stars, so called exoplanets; as planets in orbits around stars gravitationally tug on the parent star, the star wobbles a bit, and this wobble gives rise to very subtle velocities towards and away from us, depending on the location of the planet in its orbit, giving rise to a slight red or blue shift in the light from the star. This gives us information about the periodicity of the orbits of the planets, as well as their mass.

that the universe is expanding(:

YouR WelomE

Red shift is of virtually no importance in determining the age of stars within our galaxy or local group. But the red shift is crucial for measuring relative velocities of those stars with respect to us. Stars approaching us are blue shifted, such as the stars in the Andromeda Galaxy. We can also determine which direction the galaxy is spinning, as the light of stars one one side will be shifted less than the light of the stars in front, or on the other side.

Starlight from galaxies well beyond our local group are uniformly shifted towards the infrared end of the visible spectrum, varying with the distance of those galaxies from us. The further away they are, the deeper red the light is from them, indicating the greater their recessional velocity.

I cannot think how stellar age might correlate with red shift.

Haptotrophic shift refers to a change in the behavior of cells or organisms in response to the presence of a gradient of adhesive molecules, typically within a tissue environment. This phenomenon involves cells migrating or orienting themselves along the gradient of these adhesive cues rather than moving through a fluid medium. It plays a significant role in processes like tissue development, wound healing, and cancer metastasis, where the spatial organization of cells is crucial. Understanding haptotrophic shifts can provide insights into cellular behavior and tissue engineering.

The redshift tells scientists how fast a star or galaxy is moving away from us.