What is the nature of time? I have been thinking about time again and what is the relationship between the speed of light and gravity. When the speed of light or close to the velocity of light is achieved time passes more slowly, strong gravitational field has the same effect on time. In the presence of strong gravity, like a black hole, time also slows down. Why is time effected that way? Why is time not a constant? Why is time not like the speed of light? Why is time relative to the observer?

Einstein was the first person to start thinking about space-time, and the warping of space time by gravity. I have always wondered if you can warp space with gravity like space was warped in Dune. I have wondered if you can trade "the spice" for "gravity" and then bend space or fold space using gravity. I read a book a long time ago that wrote about experiments that the Navy was conducting using huge electo magnetics on ships and then passing the ships through the magnetic field, strange things happened to the ship and the people. That is about all I remember of the book. The warping of space-time is also the idea behind "Star Trek" the warp engines "warp space," thus the Star Ship is able to traveling faster then light. Maybe the relationship that time has between speed and gravity is space itself; resulting in the term space-time. I am only speculating , I am no expert, just thinking about what all the physics books said that I have read over time.