A theory to account for the spiral structure of galaxies.

Supposing that such a wave could be set up in the first place, the theory suggests that the spiral arms mark the positions of regions of higher than average density, which rotate around the galaxy.

Stars orbiting the center of the galaxy spend a considerable amount of time in the higher density regions before moving out, with the higher density also favoring the formation of young stars by fragmentation within it.

A waveform that has at least three states (for example, positive, off, and negative).

It has less harmonic content than a square wave.

A waveform that has at least three states (such as, positive, off, and negative).

It has less harmonic content than a square wave.