When astronomers observe the spectra of distant galaxies, they notice that the hydrogen emission lines are shifted noticeably toward the red end of the visual spectrum, a phenomenon called red shift. red is lowest frequency of visible light. what does red shift indicate about the movement of the distant galaxies?

We interpret that to mean that the object is moving away from us. So far, that's the only way we know of that light can get red-shifted.

The other question you should think about is;. How do we know what the wavelength of that light WAS when it started out toward us ?

when cloud cover increases then the suns ray's which provides the earth with light and warmth gets covered due to the due to the suns ray's being blocked, the temperature in that region

therefore to conclude i would like to say that,

=more the cloud cover, the lesser the

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