What is empty space?

If zero gravity has the amount of mass to lift a liquid or a solid object,it must be some thing.Plus this zero gravity fills outer space.If it is full of gas etc. that is an element/elements right there!But even if everything in outer space was taken away(plus toxic and gas) it would be as full as an over flowing cup!Example:is the air a (thing)yes!It is made of tiny particles we cannot see.I bet you are wondering:'If the stuff we breathe is tiny particles (enough to surround us,then why don't we choke on it?The answer to that is that there are many many different particles.If we took the air away there would still be many particles all around us,same thing with space.That is my theory of outer space.

An empty space is like an empty mind where nothing else exist but an awareness that it is there and you cannot deny its existence because it is there, ever present like your TV screen that holds the ever changing images of forms of light particles appearing on it. The space is essential for the energy to freely be. Someone mention that you may remove energy from space but where are you going to send this energy to? Another space? Once you create a void, there is imbalance of energy in space and that will create a shift, a motion of energy and who knows what formation might take place to stabilize the situation. It is the space that holds the energy and space is the characteristic of energy itself. Energy and space is one and you cannot divide nor separate it. It is and will always be.

I think this may be an old concept. It seems that now is believed that space is not empty, i.e. that it contains something known as particles. Some refer to the fabric of space. It was stretched out in the beginning. It is not visible to the eye, as atoms and quarks are not visible, but the electric fields that exist are none the less there. Maybe it is like the ocean with floating objects in it. At any rate, it is mind-boggling!

I think the main question is not if the space is empty but if is really there
Remember Einstein theory that states that that for a moving object time passes at a different rate than the observer of the movement

I'm just thinking what if that is the basic condition for time to exist is movement (if movement can alter time then it can be considered in a way time motion)and actually we are the ones in the moving train(moving at speed of light),
That will explain a lot of things think about it

Gravity will make sense all of a sudden(think of it as inertia in the train)
time will make sense(i haven't seen anyone asking why time passes except when we are late at smth )
empty space will make sense (is actually not empty but filled with particles moving at a different speed in time)
black holes will make sense (once an object reaches a critical mass will start to slow down )-- think u have a small cap of coffee on a table in the train it will stay put in motion , now think about a cargo crate that is put in the train without being secured -- it will slip of the train eventualy
Anyway i don't know much about physics but i just felt i should express these ideas
The interesting thing is that there is some research done regarding particles that are moving faster than light (ion radiation affecting astronauts-- but those radiation have smth special like they are not part of our space) so there is actually a reper to take in raport to which the speed of every particle we know including us is higher than light that will explain also why we can't accelerate a particle in our know space to the spee of light -- it will slip of the train (increase in mass)and eventualy colapse leaving behind a black hole (which is nothing else but a point in space where particles are loosing to much speed -- my opinion)-- the cargo sliping from the train will take with it also the coffe cup that is sitting on it

space, devoid of what we know as matter, is a 4th dimensional fabric consisting of space-time, various fields (which we know barely anything about, an example being the higgs field [see higgs boson]) as well as things like the barely understood dark matter (which makes about 25% of the universe) and the even less understood dark energy (about 70% of the universe)* you've asked quite the question

*yes, all normal matter combined is only about 5% of the universe