Describe the structure and composition of the universe

The universe is composed of clusters of spacial bodies, depending on size and number of one unit, they can be called as clusters, superclusters, galaxies and aside from this notable groups we have space. The universe in terms of chemical composition is vastly made up of atoms and molecules, however with very little percentage of successful space exploration we are yet to note of the actual elemental composition of this vast universe. Although for starters, with the help of science we are able to study our own earth and sun and found some important and key element present, carbon, oxygen, hydrogen and helium.