Introduction to Cosmology and the Composition of the Universe

Have you ever looked up at the night sky and wondered how the universe began, what it is made of, and how it continues to change? Understanding cosmology allows us to make sense of the vast cosmic structures and physical laws that govern everything from tiny particles to entire galaxies. This text-only course guides you through the fundamental scientific concepts of space, time, and matter, starting with essential terminology and the historical foundations of astronomical observation. By reading and analyzing the core principles of astrophysics, you will gain a clear perspective on our place in the cosmos. What you'll learn: Understand the leading scientific theories of cosmic evolution, including the Big Bang theory and cosmic inflation; Analyze the composition of the universe, distinguishing between ordinary matter, dark matter, and dark energy; Explore the formation, structure, and dynamics of our solar system and its planetary bodies; Examine how modern astronomers use spectroscopy and light analysis to study distant stars and galaxies; Learn about the lifecycle of stars, from nebulae to black holes and stellar remnants. The course begins with foundational definitions of cosmic scales and basic physics concepts before guiding you through the evolution of the universe and planetary systems. This course is designed specifically for beginners with no prior background in astronomy or advanced physics. Start your journey into the cosmos today and build a deep, structured understanding of the universe.