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It is called red-shift.

It shifts to the longer-wavelength, shorter-frequency direction.

For example, visible light shifts towards the infra-red area of the spectrum.

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16y ago

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When the spectrum of light from a star is Redshifted the star must be what?

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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.


Is light part of the radio spectrum?

No, light is not part of the radio spectrum. But, both the radio spectrum and light are part of the electromagnetic spectrum. The electromagnetic spectrum is a range of frequencies from very low to very high. Light frequencies are higher than radio frequencies but both are the same kind of thing.


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