I am in a heated debate about the laws of physics with someone who's sole answer to all of my statements has been "because god made it that way". Rather than get into that debate, I was wondering if folks could look over my hypothesis about why the universe is accelerating and point out the known issues with it. I wrote it in a very simple language to this person who has no understanding of physics. I have no professional background in physics, and I know that my understandings are extremely simplified and probably wrong, but are my basic concepts possible explanations? Thanks for the help. The expansion of the universe is supposedly a mystery. People can’t seem to figure out why space continues to expand rather than slowing its expansion and eventually collapsing back into itself. By looking at biology and simple physics, couldn’t it be assumed that the universe is expanding due to vacuum pressure and the desire for order and even distribution? If this concept doesn’t make sense, look at a biological cell. Cells ‘regulate’ their water content with the surrounding environment, and ‘seek’ equilibrium. When surrounded by too much water, they absorb this fluid through their walls to reach equilibrium, reaching hypoxia and destroying themselves. This destruction comes because they try to equalize their water content with their environment, swelling them to beyond their physical capabilities to hold. Another similar concept is industrial vacuums. If you have a chamber and attempt to pump all of the matter; gas, particles, etc. out of it, the few remaining bits of matter will expand to evenly fill the empty space. You will not end up with a small section of matter in a large empty space, as you would think would happen from particle gravity. If you had a cup of water in a vacuum chamber, and sucked all of the gas out of the chamber, the water would quickly boil, and turn to water vapor, and the vapor would not remain in the cup. It would rapidly expand in the ‘empty’ space, filling it with spread out particles. These particles would constantly be moving to fill the empty spaces between other particles, so a rapid churning of vapor in the very sparsely populated space would occur. The big bang, the expansion of energy from the center of space, which has cooled to become matter, and everything that we know, essentially threw radiation, light, and gases outward in all directions. Since there was nothing outside of the big bang prior to it occurring, we have what physicists would call simply “nothing”. By their definition, since there was no matter, and no discernable boundary, there was simply nothing. When you try to label this nothing in terms of something normal people would understand, I would say it was more of an everlasting vacuum. A huge empty area, but calling it an area means it has borders, which it doesn’t. It goes on forever. We define space by describing what is in it, and where it is, and since it has neither of these, it is safe to call it “nothing”, but it really is something. We just don’t have words to describe it. Any ways…. We essentially have this ball of some sort of matter, energy, or higgs boson particles in the center of what would become our universe. We then have this huge expanse of nothingness, ever reaching in all directions. Matter likes to hang out together, (see gravity) but even more so likes to fill empty spaces. It likes things to be uniform. We like balance. So this expansion of matter, plasma, light, and other energy begins flying out in all directions. Light leads the way, since it is the fastest moving thing known to us currently, followed by everything else. This matter expands in all directions, filling the “lack of matter” as it goes. As it fills the space, it is working on evenly distributing itself in this new space (space being the area that matter now exists in). Since we have an area where matter exists, ie. Space, and an area beyond it where it is still a perfect vacuum (although some of this area now has light or radiation expanding through it), matter is pulled (sucked, thrown into, or just wants to be in for the universal laws of uniformity) into the emptiness. As the expansion of mass, matter and light expand, the radius of filled space continues to grow. The center of our universe is filled with matter, and as you get further out, you run into an “edge” of expanding space. From simple physics we know that this leading edge should have less energy and matter than further into the now filled space, as you took an expanding sphere with the same matter and energy, and stretched it over a larger area. Think of a circle of particles of sand, and stretch this same circle into a larger circle. The sand will have a lower density over the circle, because you have the same amount of matter stretched over a larger area. As this leading edge gets less and less dense, it means that the space between matter on this leading edge is increasing. This means that the vacuum pressure INCREASES as the density of matter in the expansion increases, with less gravity amongst leading edge particles and more an increase in volume to fill with less matter. This would drive matter to accelerate its expansion. It would continue to accelerate as it tries to fill more fringe volume with less matter. This explains the acceleration of the expansion of the universe. The only question that I don’t know the answer to is whether this acceleration would counter the collapse pull of gravity from the matter of the universe. From my knowledge though, gravity is a weaker force, and tends to diminish fairly quickly as you get further from other mass, while getting further from mass actually accelerates vacuum pressure influences.