The laws of physics, especially thermodynamics, guarantees that at some time in the future, there will be no life. The Universe is winding down, and there is no hope to eternally preserve humanity, or even single-celled life.
Old CRT monitors have old flyback transformers, which emit an audible (for some at least) sound in the frequency that they are running. The horizontal sweep frequency on low resolution modes can be in the upper range of human hearing. Nothing magnetic about it, just plain old sound and some people having slightly better high frequency hearing in their youth.
Don't worry, that annoying sound will go away once you're in your twenties, or you've gone to a few rock concerts.
Measurements of galactic movement are based on the fact that all other galaxies have a redshift, i.e. they are moving away from us and the doppler effect has shifted their light frequency toward the red end of the spectrum.