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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
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).
What does a blue and red shift of absorption lines in a spectrum indicate?
Blue shift is a decrease of a signal's wavelength, and/or an increase in its frequency, due to the Doppler Effect. This indicates that the object is moving towards the observer.
Red shift is the increase of a signal's wavelength, and/or a decrease in its frequency, due to the Doppler Effect. This indicates that the object is moving away from the observer.
Observation of the red shift of galaxies suggest that the universe is what?
Expanding
Or that the light is exiting a gravity hole (star).
Datum shift refers to the adjustment of coordinates from one geographic datum to another. This is necessary when working with maps or geographic data collected using different reference points, such as changing from NAD27 to WGS84. Datum shifts ensure that spatial information is accurately aligned across different datasets.
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).
What is a redshift in a light spectra?
Redshift in a light spectrum refers to the increase in the wavelength of light compared to a stationary source. This increase occurs when an object is moving away from an observer, causing the light waves to stretch and shift towards the red end of the spectrum. Redshift helps astronomers determine the speed and distance of celestial objects in the universe.
A shift leader is responsible for coordinating and overseeing the tasks and activities of a specific shift of workers. They typically delegate responsibilities, ensure smooth operations, handle customer service issues, and communicate vital information to the team and management. Shift leaders also may assist in training new employees and maintaining a positive work environment.
What increases as an object comes closer to an observer?
As an object comes closer to an observer, the object's apparent size increases, allowing the observer to see more details. The object's brightness may also increase due to a larger portion of light being collected by the observer's eye or camera. Additionally, the parallax effect becomes more pronounced, providing a sense of depth and movement to the object.
Objects must be very large and moving at high speeds relative to an observer in order for their light to exhibit a measurable red shift due to the Doppler effect. This is commonly observed in astronomical objects such as galaxies and quasars located far away from us in space.
Does a red shift indicates that objects are moving toward earth?
Red shift occurs when an object moves away from the observer. So as you are on Earth, it is when objects move away from Earth. (Blue shift as it moves closer.)
A star's red shift could be due to losing energy to gravity.
The mid shift is a term used for standing a watch between the hours of Midnight and 4 AM. In military parlance this would be the hours of 00:00 - 04:00.
Watch standers on the mid-shift would be provided a meal of cold cuts called Mid-Rats for Mid Shift Rations in anticipation of hungry watch standers.
A "watch" is a duty period other than the normal work time on a ship or base usually involving some operation aspect such as Engineering, Operations, et cetera.
What else supports the big bang theory besides the red shift?
Other evidence supporting the Big Bang theory includes the cosmic microwave background radiation, the abundance of light elements in the universe, and the large-scale structure and distribution of galaxies in the universe. Additionally, observations of the universe's expansion and the Hubble law provide further support for the Big Bang theory.
What does a shift toward the red end of the spectrum mean?
When hearing to a sound from a moving source, we notice a change in pitch (frequency) as that source moves towards us, and then passes us and moves away, eg. think of the difference in sound frequency of fast moving cars if you've ever seen a formula 1 grand prix. This difference in pitch is due to the Doppler effect.
The Doppler effect can also be observed in light waves. To understand this, we first need to explore what is meant by a spectrum and how it is observed.
When white light passes through a prism, it is dispersed, in other words, split into its component colours (red, orange, yellow, green, blue, indigo, violet - the colours of the rainbow). This is known as the visible spectrum of light. The colours of the spectrum always appear in this order, and its important to remember that the colour of light depends on its frequency. Blue light has a high frequency, and red light a low frequency. Now, when we observe the spectrum of light from a hot glowing gas (such as hydrogen or helium as in a star), we won't see all the colours, but only certain lines (this is due to the change in energy levels of electrons within the H or He atoms). The resulting spectrum is known as a line emission spectrum. Since all stars are made of the same gases, when we look at their line emission spectra, the lines of colour should all be the same compared compared to each other.
However, we notice that the line spectra of distant stars are shifted closer to the red end of the spectrum, (the colours will be "redder") meaning that the light reaching us is at a lowerfrequency than we expect. This means that the source of the light, the star, "must" be moving, just as in the Doppler effect applied to sound, a car moving away from us would have a lower pitch.
If the moving object was approaching us, we would see light as a higher frequency, and therefore the lines in the emission spectra would shift toward the blue end of the spectrum.
The key to understanding the red shift is to remember the Doppler effect in terms of the moving car, and to remember that colour is the frequency ("pitch") of a light wave.
First: sound Doppler is not quite Relativistic Doppler.
Second: a shift towards the red end of the spectrum means the light has lost energy. Could be lost to movement, a Doppler shift, or could be lost due to gravity, a gravity-hole effect.
A red shift in the spectrum of the light from an object indicates the object is?
moving away from us.
What does a red shift in the spectrum of light from an object indicate?
The visible spectrum contains two ends, infrared and ultraviolet. A shift of light towards the infrared end typically indicates the object is receding from the observer.
Another explanation is that the object may be entering a deep gravity well, which would also stretch and distort light reflected or emitted from the object.
What theory does red shift support?
Red shift supports the theory of the expanding universe proposed by Edwin Hubble. The observed red shift in the spectra of distant galaxies indicates that they are moving away from us, providing evidence for the idea that the universe is continuously growing and expanding.
A Doppler red shift indicates?
that an object is moving away from an observer. This red shift occurs because the wavelength of light is stretched as the object moves farther away, causing it to appear more red. This effect is commonly seen in astronomy with galaxies moving away from us due to the expansion of the universe.
In 1848, Hippolyte Fizeau first noted a red shift in stars.
In 1912, Vesto Slipher first noted a large red shift in nebulae.
In 1929, Edwin Hubble published his findings that the size of galaxy's red shift was proportional to its distance from our Earth.
Who discovered red shift in the starlight from distant galaxies?
Vesto Slipher and Edwin Hubble were the first who discovered a red shift in nearby Galaxies and as telescopes improved the formula could be applied to more distant Galaxies. The instrument that determines red or blue shifts is called a Spectroscopy.
Ans. 2
The person who discovered (and explained) red-shift in the light from other galaxies was Vesto Slipher.
Edwin Hubble, using Slipher's observations, realised that the amount of red-shift was proportional to the distance of the galaxy being observed. He formalised this as "Hubble's Law". This was what led cosmologists to the conclusion that the Universe is expanding. (see * below)
The instrument that shows a spectrum is a spectroscope; that which measures it is a spectrometer and that which records it is a spectrograph. The instrument that measures red-shift of a distant galaxy can be anything from a travelling microscope to a ruler, depending on the quality of the photographs. Spectroscopy is the name of a set of processes, like photography or cookery , not any particular instrument.
* The larger stars/galaxies are visible from further away. The larger stars/galaxies have a larger red shift without regard to their distance from us. (re: larger means more gravity means more red shift)
Its part of science!
Edit : In astronomy, the Doppler effect is the change in wavelength of light caused by movement of a light source such as a star or a whole galaxy.
The term "red shift" refers to the increase in the light's wavelength from the
blue to the red end of the spectrum. This happens when a light source is
moving away from us.
I don't want to over complicate things, but there is a similar thing
called the "cosmological red shift ", but that's caused by the expansion
of space itself.
Explain the red shift in detail How does the red shift help to prove the Big Bang Theory?
Objects emit light in different wavelengths which we perceive in varying colors (and also those we can't see, such as ultraviolet, x-rays, gamma rays, etc.) With that in mind, think of redshift as a movement away from you, as indicated by the distance between the waves of light (emitted from some celetial body, such as a galaxy). It's essentially the Doppler effect, only with light instead of sound. It's called a "redshift" because the longer the wavelength of light, the more red it appears. If something is moving toward you, it's called a blue shift, because the waves are closer together and appear blue. If you can bend the light emitted from something (with a prism, for example) so that it's full spectrum of colors are present, record what you see, then measure the light again and compare what you see with what you recorded, you can tell if something is moving if the colors have shifted (you can also measure how fast by how much they've shifted. You can even calculate the distance). The Big Bang theory basically states that space began as some small point that "exploded" and has been expanding since. Scientists have been measuring the redshifts of galaxies for about a hundred years at least, and most appear to be redshifted rather than blueshifted, which means they're moving away from us. This would imply that something is propelling them outward. It's gets kind of complicated after that, because then you get into this really exotic stuff like dark energy and dark matter, which is pretty much the forefront of modern cosmology.
OR maybe, just maybe, the Universe is not moving away from us. Maybe there is a different reason for the red shift, which we see in every direction we look from Earth. Maybe the red shift is due to light climbing out of a gravity hole (also called a star). Then the Earth need not in the center of the Universe (old explanation), and the Universe need not be expanding (newer explanation, and it still might be).
Stars moving away from the earth show a red shift Why?
The star is moving away from us. Therefore, the Doppler effect must be considered. The Doppler effect is waves (in this case light) will be compressed in front of a moving object and stretched behind the object. This stretching creates a long wavelength. Red light has a long wavelength (the longest of visible light), so we call this stretching red shift.
What does the comological red shift suggest about the motion of galaxies?
It simply suggests that they are all exponentially moving away from each other.
Larger stars can be seen from greater distances. Larger stars create greater red shifts. So you see more red shifting from further away. Ho, hum, theories come and theories go.
Where did red and blue shift occur?
Redshift and blueshift occur in astronomy when the wavelength of light from an object is stretched (redshift) or compressed (blueshift) due to the Doppler effect. Redshift is seen in objects moving away from us (e.g., galaxies in the universe expanding), while blueshift occurs in objects moving towards us (e.g., stars in our own galaxy).
