Gravity, the force of attraction between all masses in the universe, is the inward force that holds a star together.
It is gravity.
Gravity.
A star is the equilibrium of the outward force a continuous fusion explosion versus the inward force of the gravity of its huge mass.
gravity
Gravity. Well, the strong nuclear force and the electromagnetic force can pull matter together, but electrical and magnetic forces can also repel. Gravity always attracts. This particular question is pretty obviously about gravity.
There is no force opposite to gravity (except in a star where the light pressure from the fusion in the core holds the star up against gravity).
All of the forces act to make a star. Gravity is the main force, which pulls everything together, and the other forces ignite the star.
One force is the gravitational connection between our sun and the planets that make up the solar system. Electromagnetism holds atoms together. Two types of nuclear forces hold the nuclei of the atom together.
Sort of - there energy released by the fusion occurring in the core of the star balances the force of gravity trying to make the star collapse inwards.As a star evolves this balance changes and the size of the star will change over time. When the material available for fusion runs out in the core, gravity wins the fight.
It is in a state of dynamic equilibrium. The outwards force from the nuclear reaction in the core is balanced by the inward force of gravity. In fact as with many dynamic equilibria any star like the sun oscillates in size.
hold r3 with r1 at the same time
Nuclear fusion, the same reaction that takes place in nuclear warheads, only in conventional warheads it's caused by powerful conventional explosives directed inward to cause heavy elements to fuse together, and in the cores of suns (stars) it is caused by the much more powerful force of the star's gravity.
Hydrostatic equilibrium occurs when compression due to gravity is balanced by a pressure gradient which creates a pressure gradient force in the opposite direction. The balance of these two forces is known as the hydrostatic balance.