# What Causes the Curvature of Spacetime for Orbiting Bodies?

• roger
In summary, the bending of spacetime fabric, which causes the Earth to orbit around the Sun, is caused by the mass of the Sun distorting the fabric. This is similar to a heavy object on a soft mattress creating a depression in the surface, causing smaller objects to roll or orbit around it. The exact cause of gravity is still a subject of scientific debate, but it can be attributed to the interaction between matter and spacetime.
roger
we are doing forces and gravity , but what I don't understand is when the sun curves spacetime for the Earth to orbit this curvature, what causes it ?

roger

If you mean what causes the bend in spacetime fabric, it is the matter itself. In this case the Sun distorts the spacetime fabric and the Earth moves under its influence.

As I have put earlier:

"Matter tells fabric how to curve, and distorted fabric tells matter how to move"

could someone give me a precise answer ?

A simple analogy for what Doc has given you: let's use the surface of your bed for example, with the assumption you have a soft mattress.

Let's use a bowling ball (6.5kg) as the model for the sun and set it in the center of your bed. You will notice that it warps the blanket resulting in a depression around it.

Lets take a marble as model for a Earth and place it near the depression of bowling ball. Depending how close you place it, it will roll and accelerate towards the bowling ball. If the marble were set in motion around the bowling bowl, it will circle around the depression (like an car on a banked curve).

All objects will cause a depression (warp) in the blanket to different degrees relative to its mass.
Though this is a 2-dimensional model, it is analogous of how the sun warps the fabric of space-time, causing any object orbiting near its depression, to experience a force towards it.

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roger said:
could someone give me a precise answer ?

How "precise" an answer do you want? In the very first response, Dr. Brain said "mass". That's about as "precise" an answer to the question "what causes gravity" as you are going to get!

## 1. What is the concept of curvature of spacetime?

The concept of curvature of spacetime is a fundamental principle in Einstein's theory of general relativity. It describes how the presence of massive objects such as planets or stars can cause a distortion in the fabric of space and time.

## 2. How is curvature of spacetime different from the traditional concept of gravity?

While traditional gravity is described as a force between objects with mass, curvature of spacetime explains gravity as a result of the curvature of the fabric of spacetime caused by the presence of massive objects.

## 3. Can curvature of spacetime be observed or measured?

Yes, the effects of curvature of spacetime can be observed and measured through experiments and observations. For example, the bending of light around massive objects such as black holes is a direct result of the curvature of spacetime.

## 4. How does the curvature of spacetime affect the motion of objects?

The curvature of spacetime affects the motion of objects by altering the trajectory of their movement. Objects will follow the path of least resistance, which is determined by the curvature of spacetime caused by the presence of massive objects.

## 5. Is the concept of curvature of spacetime accepted by the scientific community?

Yes, the concept of curvature of spacetime is widely accepted by the scientific community as it has been supported by numerous experiments and observations. It is a crucial aspect of our understanding of the universe and has been validated by its ability to accurately predict and explain various phenomena.

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