A supernova is caused the the fusion of (in most cases helium) molecules in iron. Once you reach iron, you can't use fusion. Thus, the star can't produce the energy to keep it stable and gravity causes it to collapse.
The pressure of the fusing gasses
Gravity is the force that causes nebulae to collapse. As particles within the nebula are pulled together by gravity, they begin to clump and form denser regions. This leads to the eventual formation of stars and planetary systems within the collapsing nebula.
All stars originate in (collapsing) gas clouds - consisting mainly of hydrogen - and usually in large groups (hundreds to thousands of stars forming together).
Gravity is the force responsible for pulling particles within a nebula together. As particles within the nebula are attracted to each other by gravity, they gradually collapse and become more compact, eventually leading to the formation of stars and planets.
The attractive force between masses is known as gravity. It is responsible for keeping planets in orbit around stars and objects on Earth grounded.
The pressure of the fusing gasses
The gravitational force is the greatest force in the universe. It is responsible for holding together galaxies, stars, planets, and all celestial bodies.
Cultivision - Collapsing Stars 2002 was released on: USA: 18 September 2002 (New York International Independent Film and Video Festival)
They aren't. Stars form as a result of a cloud of gas collapsing due to gravity.
The main natural force is gravity. It is responsible for keeping planets and stars in orbit, as well as creating tides on Earth.
The answer is simple: gravity.
There is the strong nuclear force that keeps the nucleus together, but then there is also the weak nuclear force that is responsible for the radioactive decay and is responsible for the fusion of hydrogen in stars. There is also the electromagnetic force that combats the strong force and attempts to push the nucleus apart, this is, however, unsuccessful.
Like all the others - Superdense stars collapsing.
If the nebula is gravitationally unstable, it collapsing & forming stars!
Gravity is the force responsible for the formation of the solar system, the movement of objects within the solar system, and holding together stars and galaxies. It is a fundamental force of nature that acts over large distances and is essential for understanding the structure of the universe.
Gravity is the force that causes nebulae to collapse. As particles within the nebula are pulled together by gravity, they begin to clump and form denser regions. This leads to the eventual formation of stars and planetary systems within the collapsing nebula.
All stars originate in (collapsing) gas clouds - consisting mainly of hydrogen - and usually in large groups (hundreds to thousands of stars forming together).