Why is everything in space constantly moving? The role of the big bang, angular momentum, and dark matter | | Space

In the vast expanse of the universe, nothing remains stationary: Earth orbits the sun, the sun revolves around the galaxy, and galaxies themselves are perpetually in motion. But what drives this constant activity?
Edward Gomez, an astrophysicist and education director at Las Cumbres Observatory, attributes the universe’s continuous movement to the Big Bang.This monumental explosion triggered the rapid expansion of the universe from a singular, infinitely dense point, ultimately giving rise to all cosmic structures observed today.
Carol Christian, an astrophysicist and outreach project scientist for the Hubble Space Telescope, highlights that the universe’s expansion established a precedent for movement. She notes, “The beginning was movement, and so movement has been built into the universe from the very beginning.”
The universe’s expansion primarily affects vast distances. Gomez explains, “It’s not that objects are moving through space; rather, the space between them is increasing.” This expansion is most noticeable on the largest cosmic scales.

Angular momentum and cosmic rotation

Angular momentum is crucial to cosmic rotation. When two objects in space come close together, their mutual gravity pulls them towards each other. If they do not collide or drift apart, they usually orbit each other. This principle applies to everything from minuscule mineral grains to enormous…