Questions regarding electromagnetic radiation in the visible spectrum.

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how did James Bradley discover light aberration?

I do not understand his timing method. James The magnitude of the aberration could be v/c? The speed of earth is about ...
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Does near light-speed travel doppler-shift the light from the target into gamma rays?

If a space ship travels at near the speed of light towards a star, wouldn't the light from the star doppler shift into gamma rays (or worse?) and become lethal to life and destructive to space ship ...
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What is the ratio of cosmic microwave background radiation to normal radiation?

I would like to know the ratio of cosmic microwave background radiation to normal radiation in the universe. I am considering cosmic microwave background radiation to include the microwave, and any ...