As the tittle says, I am constantly hearing about spacetime, which I sort of get (it’s a 4D space, with 3 spatial and 1 temporal axis) and curvature, which I do not get. What is curved in spacetime? When we say geodesics, what are they representing? I am getting the feeling that it is something like the spatiotemporal distance between two events that is being modified, but what does it mean in physical terms? Is it even physical, since two observers can disagree in almost everything, except the order of casually linked events?
Or I am thinking it too much, and it’s only a model of interpreting observation that only approximates complex reality up to a point?
In: 5
Condition for understanding curved spacetime is that you first understand special relativity properly. If you don’t then take a step back and leave general relativity alone until you have caught up.
Once you have done that try this [https://www.youtube.com/watch?v=xodtfM1r9FA&list=PLu7cY2CPiRjVY-VaUZ69bXHZr5QslKbzo&index=1](https://www.youtube.com/watch?v=wUucK7BF-oc&list=PLsPUh22kYmNAmjsHke4pd8S9z6m_hVRur)
and this [https://www.youtube.com/watch?v=UfThVvBWZxM](https://www.youtube.com/watch?v=UfThVvBWZxM)
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