Infinity is not something that can be put into an equation. It's only a theory. You can't just go out and point at the universe and say, "Oh, it's growing so expontially so it must be infinity size". Size is something that's measureable and hence cannot be infinity.
Now when you speak of the matter in space, space is not matter. If space had matter in it, then it wouldn't be a space at all would it? In order to actually prove this, which we already did. In order to allow sound to travel from one point to another, there must be matter to allow it pass the "wave" of the sound. But when this was tested in space, sound cannot be "heard" in space. So, hence there is nothing in space, just nothing.
Another point, you can't have "infinity" matter. There's limited matter or else, there really is something outside of the universe that's supplying it with more matter to allow it expand. To back that up, say you're locked in a room that suppose to simulate "space". No air, no nothing, just you and space. Something happens to you, you all of sudden exploed (just work with me). The amount of mass that original entered, would be exactly the same as the amount of mass that left the room.
Again, the concept of infinity isn't something you can just measure, it's just all an idea.
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Looking out the window, that's an act of war. Staring at my shoes, that's an act of war. Committing an act of war? Oh you better believe that's an act of war
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