The purpose of this article is to provide teachers of science scientific definitions and illustrations to facilitate the teaching of cosmology. Secondary school science teachers can use the illustrations and their citations to pose questions to their students and to guide their students to accessible digital sites where the students can explore these concepts further. This article presents complex topics about the cosmos with illustrations that teachers of science can use to help their students to explore further. The purpose of this article is to provide teachers of science with a unified set of definitions related to elements of the cosmos that they can use as tools to motivate their students to engage in further investigations.