Gravity & Spacetime Curvature: Have I Understood?

slibbfalusken
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When spacetime is not bent the two objects, red ball and blue ball, will move strait up the y-axis as they move through time. (Space is x and time is y).
Spacetime1.png

Now I've made the assumption that either a) All things want to move the smallest possible distance to the next point in time or b) all objects move 90 degrees relative to the rotation (Curvature) of the space in their coordinates. These two assumptions give the same result. As you can see in the picture below the blue ball is now heavy and has curved space significantly. Where the red ball is the time is now pointing a bit to the left. As the two objects move through time they will now meet in one point.
Spacetime2.png

Is this what gravity is or have I missunderstood it? If not I'd be really glad if someone could show me a 2d picture of spacetime and how it actually works.
 
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slibbfalusken said:
If not I'd be really glad if someone could show me a 2d picture of spacetime and how it actually works.



 
But is spacetime really curved relative to the object itself? If I jump 1 meter up and down spacetime, in relation to me, is not going to change right? That video only makes sense to me if light or something travels next to a star or something and changes its path due to it actually traveling so far that the change in spacetime angle matters.

Also that curvature is weird. Is the planet supposed to be at the bottom? How on Earth is the curve spaced around it? I just can't picture it.

Hm if I go in from another angle I perhaps can see the point. The planet makes, from the apples perspective, the next frame in time slightly bended a few degrees. Though this can't really be imagined from an outsider perspective.

So, I don't think I fully understood just by watching those videos. I mean, I see why the ball is moving down but I don't understand the curvature itself.
 
slibbfalusken said:
So, I don't think I fully understood just by watching those videos.
Try the links in the video description of the second video (on youtube).
 
Thread 'Can this experiment break Lorentz symmetry?'

Thread 'Can this experiment break Lorentz symmetry?'

1. The Big Idea: According to Einstein’s relativity, all motion is relative. You can’t tell if you’re moving at a constant velocity without looking outside. But what if there is a universal “rest frame” (like the old idea of the “ether”)? This experiment tries to find out by looking for tiny, directional differences in how objects move inside a sealed box. 2. How It Works: The Two-Stage Process Imagine a perfectly isolated spacecraft (our lab) moving through space at some unknown speed V...
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Thread '1-Way Speed of Light'

Does the speed of light change in a gravitational field depending on whether the direction of travel is parallel to the field, or perpendicular to the field? And is it the same in both directions at each orientation? This question could be answered experimentally to some degree of accuracy. Experiment design: Place two identical clocks A and B on the circumference of a wheel at opposite ends of the diameter of length L. The wheel is positioned upright, i.e., perpendicular to the ground...
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Thread 'How can a black hole absorb matter?'

According to the General Theory of Relativity, time does not pass on a black hole, which means that processes they don't work either. As the object becomes heavier, the speed of matter falling on it for an observer on Earth will first increase, and then slow down, due to the effect of time dilation. And then it will stop altogether. As a result, we will not get a black hole, since the critical mass will not be reached. Although the object will continue to attract matter, it will not be a...
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