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Explore the vast universe beyond our solar system in this final Christmas Lecture that takes you on an extraordinary journey through the Milky Way galaxy and into the cosmos in search of extraterrestrial life. Discover how the James Webb Space Telescope, launched on Christmas Day 2021, is revolutionizing our understanding of space and serving as a crucial tool in the hunt for alien life, with insights from space scientist Maggie Aderin-Pocock who helped build one of its key instruments. Learn about the mind-boggling distances between stars as you calculate the speed of light and understand what a light year means using simple demonstrations, then examine theoretical spacecraft designs like Breakthrough Starshot's solar sail technology and the Alcubierre drive that could potentially warp space-time for faster-than-light travel. Understand how ESA's Gaia spacecraft has mapped our galaxy and confirmed that the Milky Way contains hundreds of billions of stars, setting the stage for exploring the over 6,000 known exoplanets that have been discovered since Carl Sagan's 1977 lectures when no planets were known outside our solar system. Master the techniques astronomers use to detect and study these distant worlds, including the transit method for determining planet size and orbit, and spectroscopy for analyzing atmospheric composition and detecting biosignatures that could indicate life. Examine groundbreaking research from Cambridge professor Nikku Madhusudhan's team who used the JWST to find potential signs of life on exoplanet K2-18b through the detection of sulfur-containing gases that on Earth are only produced by living organisms. Revisit Frank Drake's famous 1961 equation for calculating the number of detectable extraterrestrial civilizations in our galaxy, updated with current knowledge about the abundance of exoplanets and stars, then expand your perspective to consider the two trillion galaxies revealed by Hubble's deep field images. Join British astronaut Tim Peake as he shares his experiences from the International Space Station and reflects on how space travel has shaped his perspective on the possibility of life beyond Earth, while participating in demonstrations that illustrate the challenges of space exploration and the scale of cosmic distances.
