SOLAR SYSTEM

Detailed explanation-1: -Stars live out their lives in an exquisitely detailed equilibrium, or balance, between two powerful forces–outward pressure and the inward pull of gravity.

Detailed explanation-2: -Stars are fueled by the nuclear fusion of hydrogen to form helium deep in their interiors. The outflow of energy from the central regions of the star provides the pressure necessary to keep the star from collapsing under its own weight, and the energy by which it shines.

Detailed explanation-3: -Stars in the main sequence have achieved a state of equilibrium, which means that the forces pushing in and the forces pushing out are equal and balance each other out. As long as the star has enough fuel in its core to continue its fusion reaction, the star will maintain equilibrium and stay a main sequence star.