There is a gigantic paradigm shift in progress as to understanding how interstellar and intergalactic space operate. Until now, scientists have accepted a gravity-only or gravity-mainly cosmology, that is, a belief that gravity mainly controls and governs the cosmos.
In real life, gravity is by forty orders of magnitude the weakest force in nature. Asking gravity to hold galaxies together or form solar systems is like asking the littlest kid in the school to do the power-lifting event.
In real life, ninety nine point nine-something percent of the mass of the universe is in plasma form. Because of the nature of this fourth state of matter, you get charge separation over immense regions of space and because of the charge separation, you get currents arcing through giant regions of space and more often than not, these currents, called "Birkeland currents", take the form of twisted pairs which resemble the double helix of RNA/DNA. Plasma discharge has three possible modes, dark mode, glow mode (like a neon sign), and arc mode. The Double Helix nebula in the image is such a Birkeland current.
Also in real life, solar systems like ours are originally formed up in the form of Herbig/Haro objects which amount to the electromagnetic Z-pinch points of such a double-helix current agglomerating plasma into solid objects (proto-stars, stars, planets...) and these original solar systems look like beads on a string rather than like orbital systems.
On the largest possible scale, such Herbig/Haro object strings take the form of strings of galaxies, which positively should not exist in a gravity-only cosmology.