Pull of Gravity.Where it starts?

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In summary, the gravitational pull of Earth starts at an infinite distance, as the force between two bodies is calculated using GMm/(r*r). However, the observable effects of Earth's gravity field are only present up to a distance of 2.75 billion light years. The concept of a minimum gravity force is still under debate, with the possibility of quantum mechanics and the existence of a minimum energy level for the graviton.
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gunblaze
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Pull of Gravity...Where it starts?

hi...

Juz curious... when does the gravitational pull of Earth starts?

eg:
Let's say a comet/ a space rock ...It will travel slowly in space but once it is caught by gravity, it will accelerate, right? Yeah... so when does that happen.What distance from Earth will the Earth's gravitational force starts to act on the subject.
 
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Infinitely far away, because the force between the bodies is GMm/(r*r). If your question was meant to be when the force between Earth and the comet is the dominant gravitational force, well that's an entirely different question.
 
  • #3
Well, technically, the affect of Earth's gravity field is only observable out to a distance of about 2.75 billion light years.
 
  • #4
Would quantum mechanics dictate a zero-point minimum gravity? Does the graviton have a minimum energy level so that there is a mimimum gravity force?
 

1. What is the pull of gravity?

The pull of gravity, also known as gravitational force, is a natural phenomenon by which all objects with mass are brought towards each other. It is the force that keeps us grounded on the surface of the Earth and governs the motion of celestial bodies in the universe.

2. How does gravity work?

Gravity works by the principle of mass attraction. The larger the mass of an object, the stronger its gravitational force. This force decreases as the distance between objects increases. The pull of gravity is also affected by the shape and density of objects.

3. Why do objects fall towards the Earth?

Objects fall towards the Earth because of the Earth's gravitational pull. The Earth's mass is much larger than any other object on its surface, so it exerts a stronger gravitational force. This force pulls objects towards the center of the Earth, causing them to fall.

4. Where does the pull of gravity start?

The pull of gravity starts at the center of mass of an object. In the case of the Earth, the center of mass is located at its core. This is where the majority of the Earth's mass is concentrated, resulting in a strong gravitational force.

5. Does the pull of gravity vary on different planets?

Yes, the pull of gravity varies on different planets. This is because the mass and size of planets differ, which affects their gravitational force. For example, the pull of gravity on the Moon is about one-sixth of the pull on Earth, while the pull on Jupiter is about twice as strong as Earth's pull.

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