Yeah, I know about light being slowed down through various media and all that. My question is WHY gravity takes any time to operate. And just saying lightspeed is "the limit" doesn't work. Until we know how gravity really works, we can't tell the speed.

Look at the observations. If gravity waves were detected before an event, then they'd be travelling faster than light. If they arrive a bit later, then they would be slower. If they arrive at the same time then the gravitational waves must be travelling at the same speed as the light from the event they correlate to.

So what evidence is there that they travel faster slower or equal to light?

We may soon be able to use stars as gravity wave detectors:Nearby stars as gravitational wave detectors

My senior year in high school I was taking a speech class, where the class brain and nerd explained how to visualize the 4th geometrical dimension. He started with a 2 dimensional picture of a simple cube that we immediately can see represents a 3 dimensional object. Then went on and showed us his three dimensional model of the cube he made out of balsa wood sticks. He surrounded the cube with more sticks going out wildly from the 8 vertices and joining together into a complicated visualization of how we could visualize the 4th dimension in 3d, just as we visualize the third dimension in 2d.The drawings in this thread are way more complicated than his model because he stopped at the fourth dimension. But he did explain how further modeling could theoretically represent an infinite number of dimensions all occupying the same space.

In the novel, Mrs. Whatsit explains that if we understand space to be three-dimensional, and time represents a fourth dimension, then the tesseract is a fifth-dimensional bridge between two points in time and space. ... A tesseract is the literal “wrinkle in time” from the title, which is also a wrinkle in space.

The first time I ever heard of a tesseract was when I read the book A Wrinkle in Time.

Yeah, that's why I so often trip over my own feet.

Well, if you put a foot into a tesseract, you never know where it will end up.But seriously, I have a slight thought that we may be slowly improving our concepts of spacetime to begin to begin to grasp tesseracts and 4th dimensions. We are doing it in maths. Whatever becomes usual to the next generations will be easier for them to accept and deal with.

So you're ready for a four-dimensional Rubik's cube, then? XD

Even Rubik, the guy who created the original cube, took 3 months to solve it. I cheated, and went to youtube to learn how. They didn't have youtube when he invented it, or I'm sure he would have too...