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Explore the decades-long astronomical mystery of the universe's missing 40% of visible matter in this comprehensive 21-minute video. Delve into the fundamental problem that has puzzled scientists: while astronomers can calculate exactly how much visible matter the universe should contain, nearly half of it has remained undetectable until now. Learn about the distinction between missing visible matter and dark matter, and discover how recent breakthroughs may have finally located this elusive mass hiding in plain sight within the cosmic web - the vast network of filaments connecting galaxies across the universe. Examine the cutting-edge detection methods scientists use to identify these cosmic filaments, including observations of warm-hot intergalactic medium (WHIM) and extended Lyman-alpha emissions. Understand how major space missions like Chandra X-ray Observatory and the Hubble Space Telescope have contributed to this discovery, and explore the future role of the Euclid mission in mapping the cosmic web's structure. Gain insights into how this finding represents a major milestone in cosmology and our understanding of the universe's large-scale structure.
