Through a long and arduous journey, galaxies merge and collide, essentially and gradually blanking each other out. Dark matter interacts to form anti-stars.

Remote viewers can see this interaction in real-time across the far swathes of the universe, past the light trap (the furthest we can see into the past)

The galactic nucleus plays a part in this system - once two galactic nuclei combine, we see disturbance in time, both locally and astronomically.