It's difficult to encapsulate one artistic depiction of the exploration of the cosmos. This happens to be one of my favorites, which I was just briefly attempting to sketch in order to come up with a concept I felt comfortable enough translating over to canvas or some larger space.
The astronaut in the picture represents mankind, the fishing pole with Hubble on the end - our feeble attempt to communicate across the cosmos with present day "advancements" in space technology. The bottles represent individual universes and the ocean - space and time across vast distances still unknown to us.
You can find more spacey goodness on my Carl Sagan-inspired blog on tumblr via the link below.
Ad Astra Per Aspera.