Recent content by frodeborli

All mass was brought into place from infinity.

Of course not. But we could perhaps use gigantic space ships that were the size of stars instead. So no stars, and instead we have space ships. And we move them stationary relative to each other in the exact same configuration that I was describing. We shut down the engines of these super space...

I just do not understand how a very distant object can cancel out the effect of a very close object, when no changes on the distant object can reach us faster than light. A sphere and an observer: ( ) . As each particle making up the hollow sphere "( )" gain momentum during...

That is a question of definition. If you orbit an object that is "not spinning", you could theoretically notice the same rotational frame dragging - although you will have trouble orbiting it fast enough for any noticeable effect unless the object was very massive. Because of both changes in...

This is intuitively correct for an exterior observer of a massive object where you can view all particles in this object as a single particle at its mass center. I am, however, unsure if the velocity of the individual particles is part of the math proving this theorem when a sphere is...

Imagine an empty universe, where nothing exist and time stands still. Then add lots of stars of equal size, distributed in a symmetry around a spot that we call the center of our universe. Since time has not passed, no curvature (gravity) has propagated to affect any of the other stars. No...

Yes, so outside the shell I'm speaking of there is nothing. There is no concept of "outside" the universe. But this has nothing to do with what I'm talking about here. The shell might be considered semi symmetric, since I'm talking of a large amount of mass surrounding the visible universe...

Remove every notion of gravity, and only consider curvature of space. This curvature is constant around an object of constant mass. When an object moves into this curvature, it is immediately affected by it and vice versa - there is no notion of "speed" for the curvature of space. It is already...

I've been thinking further on this: Two objects at a distance have a gravitational field. When one object (A) is considered stationary, and another object (B) moves relative to it, the first object (A) will notice the change in the gravitational field of the other object faster than the speed...

Back to the topic, regardless of my previous post. Measured from an object within a collapsing sphere, I maintain that you would experience gravity away from the center. Only for an external observer gravity would appear to be instant within the system. This because of the propagation delay of...

Which relates to: A property of us being located at a spot where mass is being created, I'm thinking, is that everything appears to move away from us, because gravity is increasing. The *distance* is not increasing - we are all still at the same spot - if observed by an external observer...

If the sum of mass was large enough (surrounding the entire universe), could it not be measurable on a scale of for example 10 million lightyears, the threshold where Newtonian physics start to become inaccurate? Are science certain that it only becomes appreciable when extremely close, no...

I've read that document now and I'm thinking that it is only correct for an external observer: An imaginary universe built up by two objects. One object is defined (by us) as being stationary (A). The other object (B) can be freely moved around by us. When we move B closer to A, B will...

If the shell is 14 billion light years across, and you are 1 billion lightyears away (on the inside) from one side - you will be affected by the increase in gravity from "your side" of the shell before the increase in gravity from the other side reach you. The increase in gravity comes from your...

I've been philosophing about Newtons shell theorem, which tell us that inside a symmetrical sphere, gravity is zero if the sphere is hollow, and linearly declining while moving closer to the center if the sphere is massive and of constant density. Now, if the sphere was hollow it would...