[bigbang]

well this is a serious question i can,t think apart of it ! it is so big
it seems that you are looking for a question not an answer !cause the things that you are saying is infinite .
galaxy , stars and so on
now days , scientist try to study on limited things actually not big things .they study in atomic Scale and in quantum mode (in quantum physics there are another rules exist that are different with rules in macro and is not simple actually complicated) but there are many theories that try to explain what is going on in our universe
physicist said that the possibility that there are another creature exist some where in this universe is equal with the possibility of our existence in this world
but as you know it is hypothetical
i think by my self that with the science that we have now , we can,t understand the world , let me say an example
think that the world is like an onion
and we have layers of universes that expands if you want to move from the center to the outer most layer .you should,nt choose radial movement you should,nt go up or down there are another vectors that is beyond our imagination and there you can you can choose where to go
(if you can imagine how onion look like )
but the problem is that we don,t know where we are exactly and how far we are from the center and as you know the universe expands every time
so the place that we are is far from the place that we are in second ago
so with spaceship and these kind of mockery devices that shows in sci-fi movies
we can,t do any thing
it is look like this , what do you feel if you try to understand the 3d world but you exist is 2d world
do you understand me ? think about a door that it is close and open in a same time ! how could it be ? well in 4d world it is possible and what if i say there are infinite possible dimensions then what do you think ? you think time is linear but it,s not ! time is not a constant it is a variable by it self, it has different kind of reaction by it self it is a justify for us or maybe an illusion
maybe time is not exist in the way we think
but i want to focus on the subject you say : universe
we can,t understand what is going on if we won,t jump out from the 3dimensional world that we live in
we can,t reach the light speed in this mood we can,t estimate or examine our theories by these kind of technology,s
we should change our vision and study in super small atomic scale , enrichment in other possible dimension and try to understand how it work then we can do some thing .but about the purpose let me say you , there are two groups of scientists one of them are don,t believe in intelligence design
and the other one are believe in that , as they say : the world is like a vector and everything is connected to each other and there is a rule between them but it seem,s that some thing or maybe someone keep everything around us in the right order
most of them believe in god