Galaxies and matter forever cross the large expanse of the universe, expanding outwards in what we know to be at an accelerated rate.
Opposite to intuition, our local galaxy and its neighbours revolve in a trajectory to eventually collide. Around eight hundred million years ago, a course was set for these galaxies to come together. Not in a crash or chaos, but in harmonic resonance based on the wavelength of human visible light.
This process gradually increased as the galaxies merged across millions of years.