Explore the hidden wonders of the cosmos in this 50-minute talk by astronomer Matthew Bothwell at The Royal Institution. Delve into the invisible universe beyond what the naked eye can see, from infrared light to submillimeter wavelengths. Learn about groundbreaking discoveries made possible by advanced telescopes like Hubble and upcoming missions like the James Webb Space Telescope. Uncover the mysteries of ancient galaxies, red and dead galaxies, and submillimeter galaxies that challenge our understanding of cosmic evolution. Gain insights into how astronomers detect invisible light and what it reveals about the universe's composition and history. Journey through the full electromagnetic spectrum and discover how it expands our view of the cosmos far beyond visible light.