Here's why:
* Gravity is the dominant force in the universe at large scales. It's what holds galaxies together, keeps planets in orbit around stars, and even dictates the overall structure of the universe.
* The Milky Way is a massive collection of stars, gas, dust, and dark matter. The combined gravitational pull of all this material exerts a powerful influence on everything within the galaxy.
* This gravitational influence determines the galaxy's overall shape, the orbits of its stars, and the formation of new stars and planets.
While other forces like electromagnetic forces and nuclear forces play a role in specific situations, gravity is the overarching force that shapes the Milky Way and all its contents.
