None of the examples you give above in support of this mythical "gravity" that you seem to believe in proves that objects are attracted to each other by a mysterious force ( that may well be explained by invisible mopnkeys). You get the exact same results if you simply agree that objects are pushed together to a greate or lesser degree by the uneven flux of pusher particles on an object due to shielding by other objects.
This is untrue though. Our current understanding of gravity is currently based on General Relativity, which DOES provide a mechanism for gravity. Unlike Newtonian gravity before it, which simply explained the effects of gravity with no mechanism. According to general relativity gravity is caused by a curvature in space-time caused by mass. So "push" and "pull" is a bit misleading (though pull is more accurate), as things just follow the curve of space-time. That is your gravity. Now Einstein doesn't just make this up willy-nilly. It has very specific consequences and predictions, and is the BASIS of our standard model's understanding of gravity. It is quite close to Newtonian gravity in many applications - as ANY theory of gravity must be to be taken seriously. Einstein's model of gravity makes very specific predictions which, taken as a whole, explain the real world very accurately. Your theory does nothing of the sort. It is nothing more than the vaguest of conjecture.
Predicting the orbits or existsence of plantes - simple - they are pushed one way or another by the shielding effects of other undiscoverd planets.
Satelites and orbiting space junk - all you need to do is to work out the shielding effects vs. distance of the Earth, for example, and you can work out the speeds required to not be pushed back to earth.
Give me a break. You are describing how something *might* be possible when you have NO idea if it is or not. Because your theory has no empircal basis. Unlike general relativity which has mountains of empirical basis, support, and success.
Lensing of light around far distant massive objects - I guess light has some mass too, and can therefore interact with pusher particles, and can be pushed away from their straight line travel.
You guess light has some mass, eh? More vague-ass conjecture. And even if so, it does nothing to explain the physics behind the scene. Just ridiculously vague conjecture as always.
I'd venture to say that you still have no real understanding of this "gravity" that you so passionately defend.
I'm no expert, but I seem to have a much much better grasp than you do.
If it could exist, what forms it?
The curvature of space-time.
What happens to gravity after it's "pulled" something to itself? Does it use energy to "pull"? Will it get used up?
No, gravity does not seem to weaken over time to my knowledge. I'm not sure why theory would require it to, or how this presents a problem to gravity as understood by general relativity.
Does it go all the way to the end of the universe, or does it stop suddenly at a certain distance from a body?
The effects of gravity do seem to extend out indefinitely. And further, experiments show that the information transfer is instant; NOT at the speed of light. This conforms with what GR expects since gravity is nothing more than a geometric effect of space-time, and not propogated by a particle or a wave. If YOUR theory were correct, gravity would have to propogate at the speed of light or slower. Modern science shows otherwise, however.
Are physicisist slamming pieces of "gavity" together? Can they manipulate it - make an object suddlenly "pull" less? No - they can only take measurments of two or more bodies interacting and say - cavalierly - that they are "pulled" together by this invisible force. But they are not measuring this mythical force itself - they are measuring the effects of a force. And - a pushing force will explain the pheonomena measured easily, without having to resort to mysterious pulling forces probably made by invisible monkeys or multi-dimensional rubber sheets forging their lonely path through the space time....
As usual, the point you seem to miss is that a scientific model of gravity is more than some vague description, which is all YOU seem to bring. GR is a specific mathematical model that makes many predictions and has the potential to be falsified at any number of places (speed of propogation, for example). However, your "model" can only be called a model in the loosest of terms because it's nothing more than - as I've repeated a number of times in this post now - a vague description.
Light does NOT have mass. How do pusher particles affect it? Gravity does NOT propogate at the speed of light. It's instant. How can pusher particles account for this? Those are 2 falsifications of your theory right there that I'm sure you will just deny. Science is wrong, but your armchair "theory" is right? Sure!