This course provides an introduction to modern cosmology - the scientific study of the universe's structure, composition, origin, and evolution. Students will explore the large-scale properties of the cosmos, the evidence supporting current cosmological theories, and the open questions driving future research. Topics include the expanding universe, cosmological models, dark matter and dark energy, the Big Bang and thermal history, the cosmic microwave background, nucleosynthesis, early-universe particle physics, inflation, and the formation of cosmic structures.