I just had an insane quantum hypothesis. So, Einstein theorized that the vacuum of space is not truly "nothing," but instead a concept called the "Ether." This is an intangible, not directly observable "substance" that is the cause of gravity among other things. He proposed that gravity exists because this creates a field similar to a three dimensional tarp. Similar to how objects roll into a an indent in a tarp, made larger and more dramatic the heavier the object is, the mass of an object causes all other objects (that have their own attraction, proportional to their mass) to be attracted to it in three dimensional space, an effect we call "gravity." I propose an alternative theory: the Ether of a vacuum is not intangible; in fact, it is entirely tangible, but in the same way a gas is tangible. A solid has definite mass, volume, and shape. A liquid has definite mass and volume, but an indefinite shape. A gas has a definite mass, but an indefinite volume and shape. A plasma is similar to a gas in terms of these properties, but has its own differences. What if Ether has indefinite mass, volume, and shape? In fact, the only way to detect its mass would be to weigh the universe itself, and to subtract all matter from it. Ether could even have a different form of "mass" that may or may not be definite. Regardless of what constitutes as mass of Ether is irrelevant to the discourse, as it may not be "felt" in the same way a solid or a liquid could, but the effects can be seen through gravity. In fact, an obvious trait of a vacuum is the approach to zero pressure. What if pressure is a direct and observable trait of Ether, or a lack of it? The more pressure, the less Ether there is, and the less pressure there is, the more Ether there is. This contributes to an inverse correlation between Ether mass/volume (it may be determined that one is responsible instead of the other, or that they're one in the same) and pressure. Because of this, we can say that it is possible that gravity is caused by the pressure correlation caused by ether. For instance, in a vacuum, one planet has an extremely high gravitational pull. It is possible that this gravitational pull is due to the lack of Ether (also existing between molecules, which explains density and its relation to mass as well), in which all surrounding Ether is attracted to the matter at hand in order to fill the "pressure gap." For comprehension purposes, consider the concepts of mass and vacuum to be switched. From the perspective of the Ether, all matter is "nothing," because no Ether exists there, and is therefore pushed toward the matter in question. Because Ether is attempting to "fill the space" the matter is in, the matter is pulled apart as the Ether does so, contrary to our current perspective where adding more matter and increasing pressure (decreasing Ether, but this will not be considered, due to the avoidance of potential circular reasoning), due to an increased number of particles. The more pressure/matter there is, the more energy it takes to add more. This forces the matter together as there is less space to move around in, and matter attempts to "escape" the confined area (what we describe as pressure) and move to an area of lower pressure, because energy naturally moves from higher states to lower ones. If we consider Ether to have inverse properties when introduced to matter, and similar properties in relation to Ether, Ether will attempt to fill the "space" in which matter exists by moving into it, if it can. This is low pressure from our perspective. So Ether attempts to move energy into lower states as well, and in this case, it would be where matter exists. So this inverse correlation causes pressure to behave the way it does. Now, gravity factors into this a similar way. If matter is influenced by Ether, Ether could potentially move it. If this is the case, then when the Ether moves and "pushes" on the mass (the more mass, the greater the pressure and more the Ether is pushed toward it in order to "fill the space"), this creates something similar to a current if a current could be static: a variation in energy densities (though "energy" would likely be classified as a different substance in relation to Ether). Because of these variations of "energy" densities, a higher density is formed around objects of greater mass; this means that matter is attracted to these areas of higher densities (because pressure and density are correlated as well, and we can assume that Ether also fills space within the electron cloud of atoms and between atoms, and even possibly within the nucleus itself). This creates the effect we know as "gravity." Ether surrounds this matter (and the denser the matter, the less Ether there is, causing the gravity to increase with pressure), which causes more matter to be attracted to it, not because matter is attracted to matter, but because matter is attracted to Ether, which is in higher "concentrations" around objects of higher mass. The higher the Ether concentrations, the higher the attraction, creating what we know as "gravity." The benefit of this over Einstein's theory (while still entirely probable) is that this hypothesis does not require a "tarp" that we can only imagine, particularly in three dimensional space, and instead uses properties of matter that we are already well aware of. This potentially also explains the mystery of "Dark Matter" and "Dark Energy." If these substances that we cannot observe directly but affect the gravitational movement of other matter in the universe is actually Ether (in both matter and energy forms, if applicable), it solves a great portion of the mystery of what this actually is, how it works, and how it composes 95% of the universe without being observable, as what we classify as "empty space" is actually the "dark matter" we've been looking for the whole time.