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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.
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What is the difference between the red shift and the blue shift?
A "redshift" is a change in the light observed from a source to longer wavelengths. That's a change from the blue end of the spectrum to the red end of the spectrum. A "blueshift" is the opposite. It's a change towards shorter wavelengths.
Can a red shift and a blue shift exist on the same object at the same time?
No, red shift and blue shift are opposite phenomena caused by the Doppler effect. Red shift occurs when an object is moving away from the observer, while blue shift occurs when an object is moving towards the observer. It is not possible for an object to exhibit both red shift and blue shift simultaneously.
How are Doppler blue and red shift different?
A blue shift is observed in the spectrum from an object approaching the observer whereas a red shift is observed for a receding object.
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.
What is the difference between red blue and white stars?
Red stars are cooler and emit more red light, blue stars are hotter and emit more blue light, while white stars fall in between and emit a broader spectrum of light. This color variation is due to differences in the stars' temperatures and compositions.
What is the difference between the red shift and the blue shift?
A "redshift" is a change in the light observed from a source to longer wavelengths. That's a change from the blue end of the spectrum to the red end of the spectrum. A "blueshift" is the opposite. It's a change towards shorter wavelengths.
What is the opposite of the red shift?
The opposite of the red shift is the purple shift.
Can a red shift and a blue shift exist on the same object at the same time?
No, red shift and blue shift are opposite phenomena caused by the Doppler effect. Red shift occurs when an object is moving away from the observer, while blue shift occurs when an object is moving towards the observer. It is not possible for an object to exhibit both red shift and blue shift simultaneously.
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