When science makes observations on the universe and combines those observations with common sense, at least for me it generates extremely peculiar results. For example if the universe is infinite, does this exclude the 'multiverse theory'? After all if an object is infinite, then that object is the outer most layer of something which can exist. A football and a baseball cannot both be infinite at the same time. If our universe is infinite, then everything which exists MUST be inside of our universe. Secondly, observation tells us that the universe doesn't have an arc or 'horizon' so does this not support an infinite, shapeless universe? I understand that science cannot publish anything without direct unequivocal proof but what constitutes as direct proof in the case of whether the universe is infinite or not? What are we looking for? What do we need to discover or know in order for a concrete scientifically backed answer? Thanks.