Linked Questions

130
votes
5answers
46k views

Why would spacetime curvature cause gravity?

It is fine to say that for an object flying past a massive object, the spacetime is curved by the massive object, and so the object flying past follows the curved path of the geodesic, so it "appears" ...
65
votes
12answers
53k views

How exactly does curved space-time describe the force of gravity?

I understand that people explain (in layman's terms at least) that the presence of mass "warps" space-time geometry, and this causes gravity. I have also of course heard the analogy of a blanket or ...
2
votes
3answers
109 views

How exactly does the curvature of space-time cause objects to “fall” into another object [duplicate]

Let me preface this by saying that I'm a high school student so my knowledge of GR might be seriously flawed. As far as I'm concerned, Einstein's theory of GR states that matter curves the fabric of ...
2
votes
2answers
172 views

Gravity and spacetime bending [duplicate]

Something that puzzles me if gravity is just bending of space time near a mass then what is gravitational force? If say two massive bodies were perfectly at rest relative to each other they would ...
4
votes
3answers
102 views

According to general relativity, why are two objects at rest attracted to each other? [duplicate]

I'm trying to understand gravity in General Relativity and I'm having some questions. I can understand that an object in orbit around another more massive object is free falling and simply following a ...
1
vote
1answer
180 views

Stationary Object in Curved Space Time [duplicate]

Things I know already 1) Rubber sheet analogy of GR is yet another misleading piece of info 2) differential geometry makes sense 3) equivalence principle makes sense 4) special relativity makes sense ...
1
vote
1answer
175 views

Is gravity due to the curvature of spacetime? [duplicate]

Having looked at this question online, multiple sources overwhelmingly support the statement that 'Gravity results from the curvature of space-time due to mass-energy'. However, discussions on the H-...
0
votes
2answers
120 views

A problem with how curved spacetime explains gravity [duplicate]

I've read quite a few online explanations of how curved spacetime is the reason objects are drawn to each other, and that gravity is an illusion. Most of them follow the same path: explain what ...
1
vote
0answers
91 views

How does bending in space-time caused by mass energy translate into acceleration of object? [duplicate]

Let say we have 2 similar apples separated by a distance apart, just their mass energy alone is sufficient to cause bending in the space-time. I think it is this bending in the space-time that cause ...
1
vote
1answer
71 views

What causes force on a body in gravitationally curved space time? [duplicate]

take the example of earth sun system. The earth is said to orbit around sun because the sun bends the space time around it . Now if by some means we stop earth in its path such that its at rest with ...
0
votes
0answers
45 views

Reason for gravitational force [duplicate]

What is the reason for the existence of gravitational force between two bodies? Why do we say it as an attractive force? What makes any two objects to attract each other?
0
votes
0answers
34 views

Computing gravitational acceleration with General Relativity [duplicate]

As seen here, gravitational acceleration as a Newtonian concept can be considered in General Relativity as an artifact of the selected frame of reference for measurements. But can one compute the same ...
0
votes
0answers
22 views

How does curved space make an obejct move toward Earth? [duplicate]

I think I understand how the equivalence principle shows how light can bend and therefore space must be curved. What I do not understand is how curved space makes an object move directly toward the ...
0
votes
0answers
20 views

How to explain in a relativistic way what would happen if you stop the Moon [duplicate]

I’ve heard that if you stopped the Moon, it would start falling towards the Earth due to time axis of space-time (time never stop). Can somebody explain that? Is it time what begins the Moon’s ...
35
votes
7answers
8k views

Why don't we feel the subtle speed change of Earth's elliptical orbit?

Earth's orbit is a slight ellipse, so to conserve momentum its speed increases when it is closest to the Sun. If the speed changes there is an acceleration. If there is an acceleration there is a ...

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