What prevents a star from collapsing under its own gravitational attraction?

In summary, according to Newton's Law of Gravitation, all objects with mass attract one another, including the atoms that make up a star. However, there are other interactions between matter that counteract gravity and prevent a star from collapsing under its own gravitational attraction. These can include nuclear fusion, radiation pressure, electron degeneracy pressure, and neutron degeneracy pressure.
  • #1
nlink1979
According to Newton's Law of Gravitation, all objects with mass attract one another. This law implies that all of the atoms that make up a star, such as our sun, are gravitationally attracted to one another. How is a star able to resist collapsing under its own gravitational attraction?

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Nicole
 
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  • #2
Originally posted by nlink1979 According to Newton's Law of Gravitation, all objects with mass attract one another. This law implies that all of the atoms that make up a star, such as our sun, are gravitationally attracted to one another. How is a star able to resist collapsing under its own gravitational attraction?

How is a table able to resist an apple falling through it if you put the apple on the table? There are interactions between matter other than gravitational forces.
 
  • #3
There are numerous interactions that counteract gravity, preventing such a collapse. In our sun, the process of nuclear fusion creates large amounts of heat and radiation; this radiation pressure keeps the star in equilibrium. In stars like white dwarfs, something called electron degeneracy pressure keeps the star from collapsing. This is a quantum effect that restricts the number of electrons we can squish into a certain volume, and acts to keep them apart. In neutron stars, a similar pressure arises from neutron degeneracy.
 

What is Newton's Law of Gravitation?

Newton's Law of Gravitation is a fundamental law of physics that describes the force of gravity between two objects. It states that every object in the universe attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

Who discovered Newton's Law of Gravitation?

Sir Isaac Newton, a renowned English mathematician and physicist, discovered Newton's Law of Gravitation in the late 17th century. It was one of his three laws of motion that revolutionized the field of physics and laid the foundation for classical mechanics.

How does Newton's Law of Gravitation relate to the motion of planets?

Newton's Law of Gravitation explains the motion of planets around the sun. The gravitational force between the sun and each planet keeps them in their respective orbits. The strength of this force depends on the masses of the objects and the distance between them, as described by the law.

What are the units of measurement for gravitational force?

The units of measurement for gravitational force are newtons (N). One newton is equal to 1 kilogram-meter per second squared (kg•m/s²). This means that the force of gravity between two objects can be calculated by multiplying their masses (in kilograms) and dividing by the square of the distance between them (in meters).

Can Newton's Law of Gravitation be applied to objects on Earth?

Yes, Newton's Law of Gravitation can be applied to objects on Earth. The force of gravity between objects on Earth is responsible for the weight of objects and the motion of objects towards the ground when dropped. It is also used to calculate the gravitational force between the Earth and other celestial bodies, such as the moon.

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