Explore the fascinating world of computational cosmology in this captivating lecture by Professor Andrew Pontzen. Delve into how intricate computer simulations have revolutionized our understanding of the universe, from galaxies and black holes to dark matter and cosmic expansion. Learn about the history of computing in physics, the parallels between weather forecasting and cosmological modeling, and the role of initial conditions in predicting complex systems. Discover how scientists use computer models to study the past, present, and future of the cosmos, including climate change predictions and the evolution of galaxies. Engage with thought-provoking concepts such as gravitational lensing, the accelerating expansion of the universe, and even the possibility of living in a simulated reality. This comprehensive exploration of computational astrophysics offers a unique perspective on how technology and human curiosity combine to unlock the secrets of the universe.