Put the parts of the universe in order from largest to smallest?

Imagine our universe as a baloon. During the 'Big Bang', our universe was basically swirling hydrogen gases compressed in the center of the known universe. The explosion which ensued triggered many chemical reactions, eventually leading up to the formation of the planets and othere celestial bodies. Amazingly, scientists have found by studying galaxies millions of light years away that, like a balloon expanding they are getting farther away from our galaxy; ( Although the Andrmeda galaxy is pulled in by the gravitational effect of the Milky Way becasue of its closeness and will eventually collide with our galaxy.) What could they be expanding into? No one knows for sure. Three is a theory of a multiverse, where parallel universes exist throughout all of space. Interseting Note: If we ever wanted to get to the edge of our tgalaxy with any technology, we couldn't, even at what Einstein described as the nfinite speed of all energy; the speed of light. This is becasue not only is the universe expanding, but its expansion resulting from the big bang is accelerating as we speak!!!