Explain why the sun does not collapse under the force of its own gravity?

Answer 1

Stars do not collapse because the inward force of gravity is balanced by the pressure generated by fusion. When stars die they do collapse. The cores of low to medium mass stars collapse to form white dwarfs. Further collapse is prevented y electron degeneracy pressure. More massive stars leave behind neutron stars, in which gravity is balanced by neutron degeneracy pressure. In the most massive stars, once fusion stops producing energy there is nothing to stop the collapse and the core becomes a black hole.

Answer 2

Because of the nuclear reactions taking place among the Sun's constituents.

A star is formed by the slow gravitational collapse of a cloud of interstellar matter. The compression caused raises the temperature until nuclear fuel ignites.

The expansionist pressure caused by the nuclear reactions is counter-balanced by the compression caused by gravity.

Sooner or later all stars collapse into themselves, so the question is not so much why does it not collapse, as when will it happen.

Answer 3

The sun does not collapse under the force of its own gravity because the outward pressure generated by nuclear fusion in its core balances the inward pull of gravity. This equilibrium maintains the Sun's stable size and prevents it from collapsing.