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If you mean the 'twinkle' of a star that you see in the sky at night, then the colors of the 'twinkle' are caused by layers of the atmosphere at different temperatures bending the light (rather like the shimmer of air you see above a hot road) and splitting it out into the component colors (like a prism).
But if you mean the change in color of a star over its life, then this relates to the how hot the star's core is and it diameter. Stars start of fusing hydrogen and when this runs out they fuse helium then heavier and heavier elements up to iron. When the star starts to fuse helium the core gets hotter and the star puffs up changing from (blue/white/yellow) to a red orange color.
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What phenomenon accounts for the blue shift of a star moving towards Earth?
The Doppler effect
How are the red star and blue star alike?
They can be the same sort of star, it's just that the one moving quickly away from us LOOKS red BECAUSE it is moving away, while the one moving quickly toward us appears blue because it is moving toward us. This is caused by a physical phenomenon called a Doppler Shift. Edit: That's a special case, but I don't think that's what the question is about. In fact I'm not sure what the question is about exactly. It's one or those annoyingly vague questions.
Observation of the shift of a stars spectrum toward the red or blue enables us to determine the stars?
The star's velocity (away from us, or towards us).
What happen to the spectrum of a star moving toward the earth away from the earth?
If a star is moving towards Earth. The light is seen as 'blue shifted'. As we look at our sun, on the colour spectrum, black lines appear. When looking at distant stars, we can tell if they are moving away from us (Red shift) or getting closer to us (Blue shift). This is because the black lines shift to the red or blue end of the spectrum depending on which direction the star is travelling.
What is the color of the alkaid star?
This name is mainly used for the star "Gamma Pegasi". That is a blue supergiant star.
What phenomenon accounts for the blue shift of a star moving towards Earth?
The Doppler effect
How is the blue shift related to the lifecycle of a star?
Not at all. "Blue shift" refers to a shift of features in the star's spectrum toward shorter wavelengths, for stars that are moving toward us. It has nothing at all to do with the composition or properties of the star itself.
If we observe a Doppler blue shift from a star the star must be a?
In that case, the star must be approaching us.
What the difference between red shift and blue shift?
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.
What are the difference between red shift and blue shift?
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.
What is a Doppler red shift and a Doppler blue shift?
A Doppler red-shift is a shift in recognizable features of a star's spectrum from the wavelengths where we know they belong toward longer wavelengths. Such a shift can be caused by the star's moving away from us, and that's how it's interpreted when astronomers see it. A Doppler blue-shift is a shift in recognizable features of a star's spectrum from the wavelengths where we know they belong toward shorter wavelengths. Such a shift can be caused by the star's moving toward us, and that's how it's interpreted when astronomers see it.
What property of the light of a far away galaxy has changed to allow it to have a blue shift?
it Will not be a star
How are the red star and blue star alike?
They can be the same sort of star, it's just that the one moving quickly away from us LOOKS red BECAUSE it is moving away, while the one moving quickly toward us appears blue because it is moving toward us. This is caused by a physical phenomenon called a Doppler Shift. Edit: That's a special case, but I don't think that's what the question is about. In fact I'm not sure what the question is about exactly. It's one or those annoyingly vague questions.
What phenomenon occurs when a star eplodes?
Supernova.
The apparent shift in the spectrum of a star as it moves toward or away from the earth is explained by the phenomenon known as the?
Doppler effect. This effect causes the wavelengths of light from a star to appear shorter (blueshifted) as it moves towards the Earth and longer (redshifted) as it moves away, providing valuable information about the star's motion in space.
How do you know if a star is moving toward us or away?
This is determined by measuring the "red shift" or "blue shift" of the star, or in other words, whether its perceived color on earth is shifted towards the red end of the spectrum or towards the blue end. This color shift effect is similar to the Doppler effect in that it is caused by the compression or rarefaction of waves by a moving object. So a star moving away from us would look slightly more red than usual because the light waves that reach us are drawn out due to the motion of the star. And conversely, a star moving towards us would look slightly more blue than usual, for the same reason.
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.
