How Does Gravity Cause Acceleration Towards a Massive Object in Space?

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Discussion Overview

The discussion centers on understanding the mechanism by which gravity causes objects in space to not only move towards a massive object but also to accelerate towards it. Participants explore concepts from Newtonian physics and General Relativity, as well as speculative ideas about the nature of space and gravity.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant seeks a visualization of how gravity causes both movement and acceleration towards a massive object.
  • Another participant acknowledges gravity as the cause but expresses uncertainty about the underlying mechanism.
  • A participant mentions understanding the mathematical aspects and the inverse-square law but questions the reason behind it.
  • One response suggests that "the curvature of spacetime" might explain the phenomenon, noting the historical perspective on gravity as an "unseen force acting at a distance."
  • Another participant proposes a speculative idea about a missing measurement in physics that describes space in a four-dimensional context, suggesting that gravity compresses space around a mass and affects how objects move through it.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and uncertainty regarding the mechanisms of gravity and acceleration. There is no consensus on a definitive explanation, and multiple viewpoints are presented.

Contextual Notes

Some statements rely on assumptions about the nature of space and gravity that are not universally accepted. The discussion includes speculative ideas that may not align with established physics.

automan
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Please forgive me if this is a basic question. I have no education past high school and this is my first post on this forum. I can only understand something if I can visualize it in my head... see the picture in my mind.

Can you describe the mechanism that makes an object in space not just move towards a massive object, but also accelerate towards it?
 
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Welcome to Physics Forums, automan! :smile:

automan said:
Can you describe the mechanism that makes an object in space not just move towards a massive object, but also accelerate towards it?
Gravity?? I'm not quite sure what you're asking.
 
Yeah, I understand that gravity does it. I understand the Newtonian math involved and even how General Relativity describes it, but I don't fully understand the underlying mechanism. I understand the acceleration is measured by the inverse of the square of the distance, but I don't quite understand why.
 
Ah. Hmm. Probably the only thing I can think of to describe it is "the curvature of spacetime". Its one of those things that are quite difficult to pin down at the source. Before Einstein, it was only thought of as an "unseen force acting at a distance", and seemed mysterious.

The inverse-square rule applies to other things as well, such as light, so I'd say its a property of space itself.


That's most of the thoughts I have on the subject. I'm a pretty much a noob, so someone else here might be able to offer you some insight.
 
I think there is a missing measurement in physics. One that describes a unit of space, not in terms of length, width, depth, but in terms of the space on a 4 dimensional plane. It's like gravity is a compression of space into a mass. The units of space around the compressed unit stretch towards the mass to fill in the void. It takes X amount of time for an object moving at a steady rate to pass through a unit of space, even if that unit is stretched towards a mass. This is what we view as gravitational acceleration towards a mass.
What do you think?
 
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