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Explore the fundamental mysteries of cosmic origins in this concluding lecture from Malcolm Longair's 1990 Christmas Lectures series at The Royal Institution. Delve into the biggest puzzle in astrophysics: how the Universe itself came to exist and evolved into its current state. Learn how scientists build models of the expanding Universe and discover why it looks uniform in every direction, despite regions that seemingly couldn't have communicated with each other. Examine the critical role of gravity in cosmic expansion and understand the concept of critical density that determines whether the Universe will expand forever or collapse in a "Big Crunch." Investigate the hot, dense conditions of the early Universe and trace back to just three minutes after the Big Bang when nuclear reactions forged the first light elements—helium, deuterium, and lithium. Uncover the mystery of matter-antimatter asymmetry that allowed matter to dominate the cosmos and explore the revolutionary Inflationary Model that explains cosmic uniformity and near-critical density. Discover how modern particle physics provides insights into the matter-antimatter imbalance and the tiny fluctuations that eventually grew into galaxies, revealing the profound connections between the vastly large and infinitesimally small scales of the Universe.
