The Universe is infinite: it has no bounds, or limits. For instance, you can go on a straight line forever. It "expands", but it does not "swell", because it

The Universe is infinite: it has no bounds, or limits. For instance, you can go on a straight line forever. It "expands", but it does not "swell", because it does not mean anything for a boundless space to be "swelling". The "expansion" phenomenon, known as "metric expansion of space" [1], is not "swelling" at all. Only the spatial scale of the Universe is expanding. Furthermore, this process is isotropic, which means wherever you are observing from, it will always seem like you are at the center of the expansion process. [1] http://en.wikipedia.org/wiki/Metric_expansion_of_space http://en.wikipedia.org/wiki/Metric_expansion_of_space EDIT: fixed typos (damn keyboard)