Navid Eghbali9 said:Can someone explain how gravity pushes? I know that it bends space-time, and I've seen pictures of this. But in all of the pictures, they are just objects on a flat surface. Is it really like this, because then wouldn't space-time itself have its own gravity.
I agree, this can be very confusing and it's often used by people who have no idea about what it really represents when they attempt to 'explain' GR. It's only a metaphor where three dimensional Euclidian space is reduced to a two dimensional model and 'our' gravity is used to imply how Einstein's gravity can affect things by warping 3D space (the downward displacement represents the altering of 3D space). If you are finding it hurts your brain then join the club and don't feel you need to relate in a faultless way, everything in that model to real life.Navid Eghbali9 said:But in all of the pictures, they are just objects on a flat surface.
Gravity is a fundamental force that causes objects with mass to be attracted to each other. It works by creating a curvature in space-time, which is the fabric of the universe.
According to Einstein's theory of general relativity, gravity is a result of objects with mass creating a curvature in the fabric of space-time. This curvature causes objects to move towards each other, creating the effect we perceive as gravity.
While we cannot directly observe gravity, we can observe its effects on objects with mass. For example, we can observe the orbit of planets around the sun or the motion of objects falling towards the Earth.
Gravity is directly related to the concept of space-time because it is the force that causes the curvature in the fabric of space-time. Without gravity, space-time would remain flat and objects would not be attracted to each other.
According to general relativity, there is no limit to how much gravity can bend space-time. However, at extremely high levels of gravity, such as near a black hole, the effects of gravity on space-time become more extreme.