Questions regarding electromagnetic radiation in the visible spectrum.

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Is the colour of a wave from a far galaxy the same for us as for a galaxy which lies between?

Because of the expanding of the universe light from a far galaxy is getting more red because the expanding of the universe will make the wave of light bigger. But is the colour of such a wave the same ...
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Is there a simple, analytical formula for the lunar phase brightness curve?

Brightness of the lunar disk varies as a function of phase angle. This phenomenon is very well established, as is the increase in brightness at low phase angles. Is there a simple analytical formula ...
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How strong does a light source on the Moon have to be to be visible from Earth?

Flashes from some meteoroid impacts on the Moon can be seen with the naked eye. How much light must a future lunar base emit in order to be visible as a dot in the lunar night (like the flag of ...
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Binocular with features like gleam night sight advantage?

Im looking for binoculars, I have seen specs like DAY & NIGHT ZOOM BINOCULARS, Full size day and night vision ,binoculars gleam night sight. Are these thing helpful when i look in ...