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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
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How does the redshift of galaxies provide evidence that the universe is expanding?
The redshift of galaxies refers to the phenomenon where the light from distant galaxies shifts toward the red end of the spectrum, indicating that they are moving away from us. This observation, first noted by Edwin Hubble, suggests that the universe is expanding, as galaxies are not just receding from Earth but from each other. The greater the redshift, the faster a galaxy is moving away, supporting the idea that space itself is stretching. This relationship is encapsulated in Hubble's Law, which quantifies the expansion rate of the universe.
Used to explain the principle of the red shift?
The red shift IS the Doppler Effect. I use the sound of a car or motor bike passing by on a road. The high pitch of the approaching vehicle suddenly drops to a low pitch as it speeds by and retreats.
Note:
Cosmological redshift is not attributed to the Doppler Effect, but to the metric expansion of the universe.
What is an effect of the red shift?
The red shift is the phenomenon where light from an object is shifted towards the longer wavelength, making it appear more red. It is commonly used to measure the speed and distance of objects in space, such as galaxies moving away from us due to the expansion of the universe.
Why does red shift support the big bang theory?
Because if everything we can see is moving away from us, and the further away the faster it's going, if you extrapolate back in time you realize that at some point everything must have been very close together. That's more or less the core of the Big Bang theory.
answer2:
The Big bang is a bust if there is no expansion , motion! Red shift is interpreted as the motion, thus the Big Bang is possible. However, the red shift is misinterpreted. Hubble himself, did not accept the red shift as recession, rather Hubble called the red shift, "a hitherto unrecognized principle of Nature".
The red shift is the indicator of the centrifugal force, associated with the "Dark Energy", the vector energy Ev=mcV. Properly interpreted, the red shift indicates no Expansion, no Big Bang.
It is impossible to shift the past. Time-travel remains a theoretical concept, and while memories can be altered or distorted, events that have already occurred cannot be changed.
What are the strengths and weaknesses of the redshift theory?
cons
quasars have have large red shift that suggest they are far away as distant galexies some quazars with very high redshifts appear to be interacting with other galexies that have lesser redshift which would suggest that quazars have ann in trensic redshift
pros
its perfect evidence to show that the universe is expanding
What does a red shift tell astronomers about stars or galaxies?
A red shift in the light emitted by a star or galaxy indicates that it is moving away from us. By measuring the amount of red shift, astronomers can determine the speed at which the object is receding and use this information to study the expansion of the universe and the distance to the object.
Does redshift move toward the earth?
No, redshift refers to the phenomenon where the light from celestial objects appears to be shifting towards longer wavelengths, indicating that the object is moving away from the observer, including Earth. This is a key piece of evidence for the expansion of the universe and is commonly observed as a feature of distant galaxies.
What is higher for closer stars A absolute magnitude B red shift C parallax D blue shift?
The answer would be C) Parallax.
The Absolute Magnitude of a star is the star's actual brightness, and is therefore not dependent upon the position of the observer.
Red Shift and Blue Shift are consequences of a stars speed relative to the observer. Again this is independent of the stars proximity to the observer.
Parallax, is the apparent change in position based upon the motion of the observer, and is directly proportional to the proximity of the object. Just as, when driving on the road distant trees or buildings don't appear to zoom past you as quickly as a pedestrian on the side of the road, so it is with stars. The closer they are the larger the parallax is as the Earth orbits the Sun, for example.
What is the relationship between red-shift and distant galaxies?
Redshift is the phenomenon where light from distant galaxies appears to be shifted towards longer (redder) wavelengths. This is due to the expansion of the universe causing the galaxies to move away from us. The amount of redshift is directly related to the distance of the galaxy from us, with more distant galaxies experiencing higher redshift.
What conclusion do astronomers make based on the red shift?
Astronomers conclude that objects in the universe are moving away from Earth due to the observed redshift in their spectra. This supports the idea of an expanding universe, as described by the Big Bang theory. The amount of redshift is proportional to the distance of the object, allowing astronomers to estimate the speed at which galaxies are moving away from us.
Who first discovered redshift?
The discovery of redshift in the spectra of light from distant galaxies was made by astronomer Vesto Melvin Slipher in the early 20th century. He noticed that many galaxies appeared to be moving away from us based on the shift of their spectral lines towards the red end of the spectrum. This laid the foundation for the theory of the expanding universe.
What does the light from distant galaxies show red shift?
The light from distant galaxies shows redshift because the universe is expanding. As the galaxies move away from us, the light they emit gets stretched, causing its wavelength to increase and shift towards the red end of the spectrum. This redshift can help scientists determine the velocity at which galaxies are moving away from us and provide insights into the expansion of the universe.
How do you demonstrate the red shift and Doppler effect?
Examine the light of hydrogen emissions from a distant galaxy.
Compare that spectrum with that of hydrogen in a laboratory.
You'll find that spectrum is identical EXCEPT that it is shifted towards longer wavelengths.
What is meant by red shift and what cause it?
Red shift is the phenomenon where light from an object in space appears to have a longer wavelength, shifting towards the red end of the spectrum. It is caused by the stretching of light waves due to the expansion of the universe, known as the Doppler effect.
What is the daily shift in moonrise?
The daily shift in moonrise is approximately 50 minutes, as the moon rises about 50 minutes later each day due to its orbital motion around Earth. This means that the time of moonrise changes by about 50 minutes from one day to the next.
What does the red shift of the galaxies tell us about their motion with respect to the Earth?
Less than you'd think. At extreme distances, the red-shift is caused by metric expansion more than by motion. So to be able to gauge the speed of an object relative to you, you'd first have to determine the pseudo-speed caused by metric expansion.
Why are the blueshift and redshift useful in the study of the universe?
Redshift and blueshift are manifestations of the Doppler effect. This lets us determine whether a star, or a galaxy, is moving towards us, or away from us.
What is a red shift and what does it tell us?
A 'red shift' is the increase in the wavelength of light received from astronomical
objects, compared to what we know the wavelength should be. It's called "red
shift" because if the wavelength of some visible light is increased, the color of the
light changes in the direction of the color with the longest visible wavelength, which
is red. If the shift is really substantial, light that left a star at visible wavelengths
may even red-shift completely out of the visible range, and arrive here as infrared
radiation.
The only mechanism we know of that can increase the wavelength of light ...
without the light passing into a different medium ... is the receding (moving away)
of the light source from us, and it's generally agreed that if the light we receive from
an astronomical object is red-shifted, then the object is moving away from us. The
faster the object is moving away from us, the greater the increase in the wavelength
of its light.
This is a big deal in Astronomy and Cosmology. If it's true, then there have been
enough observations of red shift over the past hundred years to reveal the general
pattern that ALL of the distant objects in the universe are moving away from us, and
the farther from us they already are, the faster they're moving away. This is the basis
of the statement you've heard that "the Universe is expanding".
Notes:
1) If thelight source ismoving toward us, then its light arrives here blue-shifted ... with
shorter wavelengths than we know it had when it left the source. There's not much of
that to be seen, and it's all coming from objects that are relatively close to us.
2) Strictly speaking, the expanding Universe causes the "Cosmological Redshift"
which is similar to, but different from, the "Doppler Effect".
3) There is, in fact, another mechanism for producing a redshift. Strong gravitational fields can have this effect. Some astronomers used to argue
this was a possible explanation for the redshifts of some galaxies.
However the consensus now is that it's the expansion of space that's by far the most likely cause of the redshifts of galaxies.
How does a red shift indicate that the universe is expanding?
nice question! actually when a wave approaches an observer the wave length of the wave decrease and as it move far from us its wavelength increase. it is quiet difficult to understand so use your imagination. as the wavelenght increase the spectrum will be shifted toward red spectrum and thus called red shift. when Edward Hubble studies spectrum of different star he noticed that because of some color spectrum were missing, other spectrum got shifted to ward red. it it moved toward red then that mean that wavelength was increasing and if wavelength increases then that means light moves away from us and thus he concluded that each and every star and galaxy was moving away from each other
What is the greatest observed red shift of any galaxy?
The greatest observed redshift of any galaxy is for GN-z11, which has a redshift of 11.09. This corresponds to a distance of around 13.4 billion light-years away from Earth.
What is significant about the red shift spectra of galaxies?
The red shift spectra of galaxies show that most galaxies are moving away from us, indicating that the universe is expanding. This observation supports the Big Bang theory, which suggests that the universe began in a state of high density and temperature and has been expanding ever since. The amount of red shift in a galaxy's spectrum can also provide information about its distance from us and its velocity.
