## My Theory for How Gravity Works

So I've never really found out how gravity actually works, why it happens. But a few days ago I had a epiphany. I don't know if I spelled that right.
So everything is at least a little bit magnetic, even stuff like wood, no matter how little. So all of this stuff would be attracted to all the other stuff electromagnetically, right? Even a little bit? So when you get huge amounts of this stuff (I'm thinking planets here) there is enough electromagnetic attraction to pull it together, and voila! We have gravity! Plus when you have planets, there's tons of stuff like iron and other metals and metaloids, that could be very strong, magnetically.
So if I'm wrong (which I probably am), can someone explain how gravity actually works to me? I'm constantly thinking about stuff like this, I get theories like this every once in a while, many of them right. But not this complicated, more stuff like figuring out how air pressure and vacuums work, but basic principle stuff.

active| newest | oldestThe "simple" model is that gravity is not actually a

force(although it's effects can be treated like one in Newtonian physics).Instead, mass distorts spacetime; the more mass, the more bending.

This is the bit that plaits most peoples' minds: objects move in straight lines through spacetime, but because mass has distorted the spacetime, the straight lines are actually bent, so (to those animals that only evolved to see three dimensions of spacetime and live along the fourth, they appear to move in curves such as the arc of a thrown ball or the orbit of a Moon.

kindof force is involved, just that thereisa force (specifically, a force applied perpendicular to the velocity. If it isalwaysperpendicular to the velocity (as the velocity vector changes due to the force), it's called acentral force.For the problems you're solving, I'll bet that most of the time the central force you're considering is from a string, or maybe friction on car tires, or some such thing. Gravity is one particular example of a central force. It has the interesting added complication that it's not a fixed, constant force, but depends upon the distance from the center (1/r

^{2})._{Kelsymh?}Trajectories in GR are

curved, not straight: they have non-zero second derivative along the metric-element (ds) direction. Technically, they are called "geodesics" and are the paths of minimum or maximum distance through the curved spacetime. In particular, they are curved in the full four-dimensional spacetime, not just in the three-dimensional spatial slices of a particular rest frame.A more familar example of geodesics (and the reason for the name!) involve minimum distance paths on the surface of the Earth. To get from point A to point B on the surface of a sphere in the shortest time (shortest distance at constant velocity) you want to follow a Great Circle trajectory. This path is the intersection of the plane defined by points A, B, and the center of the sphere, with the surface of the sphere.

The Great Circle path is curved in the "flat" three-dimensional space containing the sphere, but it is also curved in the frame of the spherical surface itself. Except for the special cases of travel along the Equator or directly North or South, any great circle route involves a constantly varying compass heading, and is therefore "curved" in the canonical East x North coordinate system.

_{Guess where I'm I'm going to start passing all the physics questions on to?}