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What happens when light from distant galaxies is shifted towards longer wavelength?
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Do we observe the red shift or the blue shift in most of the universe and what does this suggest about the universe?
Most of the more distant galaxies appear to be red-shifted, indicating that they may be moving away from us. (Some, like the Andromeda galaxy, are blue-shifted, indicating that they are moving toward us. In fact, the Andromeda galaxy will probably collide with the Milky Way in about 4 billion years or so. ) Because distant galaxies in every direction are red-shifted, many scientists speculate that the universe itself is expanding, and carrying those distant galaxies away. The further away they are, the faster they seem to be moving, which reinforces the "universal expansion" concept. Given that the entire field of astrophysics is less than 150 years old, I suspect that there may be more going on than we currently believe, and that our descendants six generations hence will wonder "What were they thinking?" So keep your minds open, and don't think that there isn't anything new to be learned.
How do red and blue shift show movement of objects in space?
If the distance between us and a object emitting a wave (sound or light) is increasing, then the wavelength of the wave it emits will be red-shifted. If the distance is decreasing, it will be blue-shifted. This is true for a car driving towards us with its horn blaring, or a distant galaxy emitting hydrogen lines.
The Andromeda galaxy unlike most other galaxies has?
It has the same things the other galaxies have i.e. stars planets etc . It's just that it is very big . Comments : I think the answer may be that Andromeda gives out light that is blue shifted instead of the red shift for most galaxies. So the answer is " a light spectrum that's blue shifted".
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.
When a star or galaxy moves quickly away it is called what?
We can measure fairly accurately the radial speed of a star or galaxy by measuring the Doppler shift of the emitted light from the star. Stars emit specific frequencies of light, and we can measure the frequencies to determine what elements are contained within the star. But since we know exactly what the frequencies are, we can measure the precise frequencies that we measure from the star. A star moving toward us will have its light "blue-shifted", or compressed a tiny bit in frequency. The amount of the compression tells us the radial velocity. A star whose light is red-shifted is moving away from us. Radial velocity is the part of the velocity that is directly toward or away from us; Doppler shifts don't tell us anything about a star's side-to-side motion. One of the astonishing discoveries of Edwin Hubble is that most galaxies are moving away from us, and the farther away they are, the faster they seem to be receding. Some nearby galaxies are moving closer, but the more distant the galaxy, the faster it is moving moving away. He determined this by the "red shift" of the light from distant galaxies.
The fact that the light from distant galaxies is red-shifted suggests that the galaxies are?
Moving away from us
How does redshift support the notion of the expanding universe?
The redshift of distant galaxies is believed to be a result of the Doppler effect - in other words, the light is shifted towards lower frequencies ("redshifted") due to the fact that the galaxies move away from us.
A spectral line that appears at a wavelength of 321 nm in the laboratory appears at a wavelength of 328 nm in the spectrum of a distant obect we say that the object's spectrum is?
A spectral line that appears at a wavelength of 321 nm in the laboratory appears at a wavelength of 328 nm in the spectrum of a distant object. We say that the object's spectrum is red shifted.
Who first propsed that the universe is expanding?
The astronomer Edwin Hubble was the first to find evidence of the expansion of the Universe, through his observations of distant galaxies. He observed that light emitted from most of the distant galaxies was more red in color. This is known as the Doppler effect or Doppler shift, where objects that emit a certain wavelength and move away from the observer appear to have a longer wavelength than the true wavelengths to the observer. It's the opposite case when objects emitting waves that are coming closer to the observer. These observations lead Hubble to believe that these surrounding red-shifted galaxies are moving away from us. Since most of the galaxies were moving away from us, and since Hubble found that with increasing distance between the galaxies there is an increasing speed at which they are moving apart, he concluded that the Universe was and still is expanding.
What color are distant galaxy's?
They are red shifted.
What galaxies have a blue shift?
There are about a 100 known blue shifted galaxies. The most well known, is the Andromeda Galaxy.
Does the medium of space make distance stars appear to be more red shifted only because they are farther away?
Distant stars appear red shifted because they are travelling away from Earth. It just happens that more distant stars are moving faster, so there is a greater red-shift the further a star is from the Earth.
What is the red shift and how is it important to your understanding of the universe?
Red shift is the irrefutable fact that the light from all distant galaxies (ie, those outside our Local Cluster) has a longer wavelength (ie, is shifted to the red spectrum) than it would if the galaxy were close to us. It is also irrefutable that the amount of red-shift is dependent on the distance between us and the galaxy. In conjunction with other irrefutable facts, the only explanation is that the distances between all galaxies -- indeed, all lengths -- are growing greater with time.
Do we observe the red shift or the blue shift in most of the universe and what does this suggest about the universe?
Most of the more distant galaxies appear to be red-shifted, indicating that they may be moving away from us. (Some, like the Andromeda galaxy, are blue-shifted, indicating that they are moving toward us. In fact, the Andromeda galaxy will probably collide with the Milky Way in about 4 billion years or so. ) Because distant galaxies in every direction are red-shifted, many scientists speculate that the universe itself is expanding, and carrying those distant galaxies away. The further away they are, the faster they seem to be moving, which reinforces the "universal expansion" concept. Given that the entire field of astrophysics is less than 150 years old, I suspect that there may be more going on than we currently believe, and that our descendants six generations hence will wonder "What were they thinking?" So keep your minds open, and don't think that there isn't anything new to be learned.
How do red and blue shift show movement of objects in space?
If the distance between us and a object emitting a wave (sound or light) is increasing, then the wavelength of the wave it emits will be red-shifted. If the distance is decreasing, it will be blue-shifted. This is true for a car driving towards us with its horn blaring, or a distant galaxy emitting hydrogen lines.
The Andromeda galaxy unlike most other galaxies has?
It has the same things the other galaxies have i.e. stars planets etc . It's just that it is very big . Comments : I think the answer may be that Andromeda gives out light that is blue shifted instead of the red shift for most galaxies. So the answer is " a light spectrum that's blue shifted".
What is it called when galaxies are moving toward each other?
There isn't a particular name, however, when they are moving towards us, their spectrum is shifted to the blue region. So they are referred to as blue shifted galaxies but that is only relative to ourselves. See related link for more information.
