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Explore the fundamental questions surrounding galaxy formation in this fourth lecture from Malcolm Longair's 1990 Christmas Lectures series at The Royal Institution. Delve into the complex processes behind how galaxies originated, examining the role of gravitational collapse in gas clouds and the challenges posed by our expanding Universe. Investigate why density enhancements in the early Universe grew so slowly and learn about the mysterious dark matter that must exist to explain observed galactic structures. Discover how the lack of expected fluctuations in the Microwave Background Radiation points to invisible matter that interacts only weakly with ordinary matter. Examine observational evidence from earlier epochs of the Universe that provide crucial clues about when galaxies first formed, and understand the ongoing scientific quest to directly observe how large-scale cosmic structures and the galaxies within them came into being through the revolutionary tools of modern multi-wavelength astronomy.
