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What happens to the light from a star that is moving towards us?
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What phenomenon accounts for the blue shift of a star moving towards Earth?
The Doppler effect
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.
When light from a star passes though the star's outer gases what happens to some of the light?
some of the light is refracted,some of it is absorbed while the rest is scattered into the space
Which scientist explained why binary stars change color?
Carl Vogel and Edward Pickering discovered the first spectroscopic binaries, and used Doppler's effect to explain their results. However, this question is rather confused. Binary stars do not change colour (except as part of their evolution, which happens to any star eventually). I think you may be misunderstanding what we call a spectroscopic binary. Some binary stars are close enough to us to be separable in telescopes, but many are too far away for that. One of the ways we can tell a star is binary is by spectroscopy. This does have to do with the wavelengths of light, which correspond to colours, but it is a misunderstanding to think that this involves the star changing colour. Spectroscopy involves dispersing light into a spectrum, that is spreading out the wavelengths into a 'rainbow'. When a light source is moving towards us, wavelengths are shifted towards the blue end of the spectrum and when it moves away, they are red shifted. This is called the Doppler effect. With the continuous spectrum of a star, this does not show up as a change of colour, because everything that is shifted is replaced with wavelengths from further along (the spectrum continues beyond the visible at both ends). The reason we can tell shifting happens is that there are dark lines across a stellar spectrum caused by elements in the star's atmosphere which absorb some of the emitted light. The frequencies at which these lines appear are always the same for the same element. If these lines are found at different frequencies than expected, then the source is moving. Binary stars orbit each other, so part of the time they are moving towards us and part of the time they are moving away. This results in the frequency of the absorption lines' shifting back and forward with time.
What does the Doppler shift in starlight give us?
It tells us whether a star (or galaxy, or other object) is moving towards us, or away from us; and how fast.
How fast is the light from the star moving towards the earth?
47km/h
How can astronomers determine whether a star is moving towards or away from earth?
Astronomers determine whether a star is moving toward or away from the Earth via the Doppler effect. Imagine a motorcycle moving past you. As it drives towards you, it has a higher frequency, and a lower frequency when it drives away. The same thing happens with light. As an object moves towards us, its light has a higher frequency and lower wavelength - this is called blueshift. As an object moves away from us, its light has a lower frequency and higher wavelength - this is called redshift.
How can astronomers determine whether star is moving toward or away from earth?
Astronomers determine whether a star is moving toward or away from the Earth via the Doppler effect. Imagine a motorcycle moving past you. As it drives towards you, it has a higher frequency, and a lower frequency when it drives away. The same thing happens with light. As an object moves towards us, its light has a higher frequency and lower wavelength - this is called blueshift. As an object moves away from us, its light has a lower frequency and higher wavelength - this is called redshift.
What is moving towards the star vega?
Our solar system
What happens when a star's spectrum is redshifted as a result of the Doppler effect?
With respect to light, the Doppler effect refers to the apparent change in the frequency (and wavelength) of electromagnetic radiation due to the relative motion of the source relative to the observer. When the source (i.e. a star) moves AWAY from the observer, there is an apparent rarefaction (expansion) in the wavelength of emitted light (i.e. frequency decreases), causing a shift in the emission spectrum towards the red side. This is known as redshifting --> the star is moving away from the observer. The opposite happens in blueshift, when the source moves towards the observer.
What turns red in the red shift?
light is put into a spectrum from red to blue. red shift is when a star is moving away from us so fast that the light waves stretch moving it up the spectrum, so up towards infared
Spectrographs help astronomers determine a star's what?
The star's chemical composition; the star's rotation; pulsations of the star; planets or other invisible objects moving around the star; how quickly the star is moving towards us or away from us.
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.
What phenomenon accounts for the blue shift of a star moving towards Earth?
The Doppler effect
The Doppler Effect is a phenomenon that allows one to measure an object's?
The doppler effect is the change in frequency of a wave for an observer moving relative to the source of the wave. You can measure the location and velocity of a locomotive moving towards or away from your. You can measure a star's location and velocity vector regarding the shift and color emanating from the star light. This is calculated via doppler light equations.
How do astronomers determine if a star is moving towards or away from us?
They use a tool called a SPECTROSCOPE.
How do people know when a star is moving toward or away from the earth?
blue shifted
