What is that thingThe force that pulls together the matter in stars?

The force that pulls together the matter in stars is gravity. It is the attractive force that arises between masses, causing gas and dust in a nebula to collapse under its own weight, leading to the formation of stars. As the material contracts, it heats up, eventually initiating nuclear fusion in the core, which produces the energy that powers the star. This balance between gravitational collapse and the outward pressure from fusion defines a star's stability and lifecycle.