Scientists theorize that LIGHT is a particle, or/and a wave. If a particle, it's speed could surely be limited. If a wave, would it's speed be limited (or even calculable)? Gravity, surely is not a particle. Therefore it seems likely it's speed is not limited, to anything. How can an object have speed if it is not moving?
The EFFECT of a force in the universe may have a speed. At least the measurement of that force can be translated into speed.
In the ocean, the waves move fairly fast. Except, nothing is moving, at least laterally. Nothing material is moving laterally. The EFFECT or FORCE is moving laterally via an actual movement (physical) of the water VERTICALLY.
Electricity, Gravity, Light, the key is the Vertical wave movement, not the horizontal. Though the terms vertical and horizontal are again, dependent on point of view, and only a mental visualization of what actually happens. The movement is actually circular, as are all movements in the universe. That they are seen as horizontal, or vertical, is due to being seen from one viewpoint, and two dimensions.
Say it is the universe rather than just the galaxy. The universe has no edge, but rather than having no center, each entity at whatever scale, quark to atom, to molecule, to biosphere, to noosphere is it's own center, all sharing the same coordinates of space and time from center to as far as it goes. UCANSEE2, both UCANSEE2-- bio-entity with trillions of Kreb cycles per second, and UCANSEE2--cybercreature, is the center of all. There are other centers, each particle, whether elementary particle or higher construct is a center. The center is a plurality. It's not 'no center', it's all centers.