Is Gravity caused by mass or is it an effect of mass moving in a 4-d Universe?

Question

Einstein's observation that mass causes a "depression" in the fabric of space, then what would cause the force needed to "bend" the fabric?

Answer 1

we haven't proved it yet, but einstein says one thing, and isaac newton says the other. who knows?

Answer 2

It doesn't bend in the sense that a spoon might. We can tell that it's bent but if we were to travel through the bend we wouldn't notice any acceleration associated with going through a normal bend, like on a roadway.

On top of that, space itself is massless so force on it is irrelevant.

Gravity is an intrinsic property of mass. We know next to nothing about it's origin but there are thoughts that it might hail from another dimension.

Here's a question for you. What's mass anyway?

And gravity is not caused by the rotation of the planet. This is a misconception that people get from depictions of spinning space stations, roller coaster loops, and gravitrons. This "false gravity" is created by centripetal force and for the gravity to be simulated you must be on the inner surface of something circular, not outer surface. Look it up.

Answer 3

The analogy with gravity as a depression in a rubber sheet is actually a rather poor analogy for exactly this reason.

What happens is that mass (and energy, and pressure, and certain forces) cause a distortion of the space-time geometry. Then, mass moves in this new geometry in such a way that 'proper time' is maximized. The way Archibald Wheeler said it:
"Mass tells geometry how to curve, geometry tells mass how to move".


Wow. Just IN B is wrong in so many ways I can't even start to correct the mistakes. Rotation is not the cause of gravity in our solar system. The artificial gravity you feel in a turning car is called the centripetal force and is not the same as actual gravity.

Answer 4

The depression in fabric leaves a lot to be desired, it is only two dimensional. The fabric of space is warped by a massive object.

Answer 5

Gravity's first mathematical description as a "universal" force was by Sir Isaac Newton. Newton's description remained unchanged until Albert Einsten published his General Theory of Relativity. Newton described it as a force acting at a distance, and Einstein described it as an artifact of mass and energy that curve space-time.

General relativity is Einstein's theory of gravity. Although Einsten's idea is necessary for describing the evolution of the universe as a whole, Netwon's theory works well enough when gravitational forces are not extremely strong.

In general relativity, space and time are merged into one four-dimensional grid, whose properties are uniquely specified (via gravity) by the bodies inhabiting them.When a mass is present in the above space-time it distorts it. Gravity curves the spacetime grid, so general relativity thus describes gravitational interactions as manifestations of the spacetime curvature.

Objects "fall under gravity" from less curved parts of spacetime to more curved parts of the spacetime. (When spacetime becomes infinitely curved, as in the case of black holes, the gravitational force is so strong that spacetime closes on itself, creating what is called a singularity in the fabric of the underlying spacetime continuum. Nothing can escape such objects.)

Einstein described gravity as a deformation in space, caused by the presence of massive objects, similar to the way a heavy ball would warp a sheet of rubber. This deformation 'told' smaller things how to move through space, so they either went into orbit or fell onto the larger celestial object. Einstein would have argued that gravity is just objects following the shortest path possible through space-time (a space-time geodesic). Einsteins theory of relativity predicted that objects with great mass deform speace around them, causing light to deflect into them. That has been shown to be true. He also predicted that gravity could travel in gravity waves, which we haven't seen yet.

Gravitational waves are somewhat analogous to the waves of electromagnetic energy that we call light. Light waves are created by electric charges in motion; similarly, gravitational waves are created by masses in motion. Gravity waves are easiest to conceptualize when they are regarded in a similar sense as electromagnetic waves: they carry information about a change in a gravitational field with time.

Answer 6

A mass is a compacted gravity, that tends to expand and dissolve in the ocean of fabric of space. The reality oriented structure of mass prevents the compacted gravity to expand in outer gravitation in space, that causes a depression.

My definition of reality (the created reality) is that it is the structural and host nature of identities, that keeps something based on some other thing.

Ultimate and absolute reality (the uncreated, self sustainable reality) is Allah All mighty.

Answer 7

The simple answer is we don't know. Some physicists postulate something called 'the Higg's Field' defining the Higg's field causes all sorts of headaches among a lot of very brainy people.

Answer 8

It is mass attracting mass. We had 2 satellites in a polar orbit to measure the ionization over the poles and it was difficult to keep Them apart.

Answer 9

Gravity is: The force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its SURFACE; "the more remote the body the less the gravity"; "the gravitation between two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them" If you want to feel something similar to this, just turn a corner in a car, if you turn left, you move to the right, if you turn right, your body shifts to the left. This is known as cintrifical force. Any atom containing anything in it contains mass, or it would not exist. So as far as weightlessness goes, I am not sure it exists. But in space, it might. Space, is basically defined as emptiness, because space is made of nothing that we can as of so far prove. So to me, a depression in the fabric of space could only be caused by the tremendous pressure caused by any structure containing mass forcing the "space" to move out of the way so it could be there. It is like filling up a balloon with a gas to the point were it is almost bursting, and then you put just a little more gas in the balloon, causing it to expand to the point were it cant take the pressure and it explodes. I think this is somewhat like his Big Bang theory.

Answer 10

Does anyone else think Just IN B has never actually studied any actual physics?