Pondering the Cosmos

How is it possible that I can ponder the cosmos? I am a structured conglomeration of molecules
that is very tiny living within a gigantic universe, yet my brain is able to grasp said universe intellectually as a whole in relation to myself and think about it; its origin, its end, its continuing existence, its purpose or meaning, its makeup. Is the human brain, in some sense, bigger than the cosmos? I cannot physically grasp the cosmos with my hands, but I can imagine it as a whole, like
a bubble or a cloud, and examine it with my mind's eye. Light and darkness put together with eyes
to see and what have I got? Do light and darkness have any meaning apart from vision (someone's)
or perception? Why is not all dark? Is light a characteristic of the cosmos or of an eye (like the one
pictured on the back of a U.S. dollar bill)? I do not know. There is light in the cosmos, which Dr.
Einstein said is the fastest travelling phenomenon within it, and there is darkness in the cosmos.
Scientists, cosmologists are puzzled by what is called 'dark matter' and 'dark energy,' yet they, we,
cannot come to understand the universe without these dark, unknown things which are out there
affecting gravity. Light is made up of photons. Perhaps darkness, physically, is not absence of light,
but micro-matter, which by its nature, voids light. So yes, darkness on a cosmic scale is absence of light, but what is there in place of light that causes its absence? The cosmos is filled with light of many wavelengths, but there is also darkness. Is this fact because light has not reached certain areas of the cosmos or because light cannot possibly reach certain parts of our universe because these parts already contain dark matter? Is it a law of physics that dark matter (I don't know; call it a gloomy mix, each
dark particle - a 'gloomer' with distinct properties yet to be measured) cancels out photons? What is
more primal, light or darkness? I realize that I'm speaking about dark matter and dark energy without fully understanding these concepts in the context of cosmology. The word 'dark' is used therein to refer to human ignorance of what is being observed with telescopes and other technology.
Yet philosophically, I'm speaking of basic properties of our cosmos, Carl Sagan' s cosmos. These things have a lot to do with the eye of the beholder (not unlike a certain tenet of quantum physics).
So here I'll leave it and ponder some more. Later.