Explore the fascinating world of cosmic sound waves and their role in measuring the Universe's composition and history in this Harvard University lecture. Delve into the detection of fossil imprints from sound waves using galaxy distribution maps from the Sloan Digital Sky Survey. Gain insights into the shape of the Universe and the evolution of dark energy as Professor Daniel Eisenstein presents an overview of the cosmological significance of sound waves and the observational program. Learn about dark matter, the expanding Universe, and the surprising discovery of dark energy. Examine the microwave background, acoustic oscillations, and the concept of a standard ruler in cosmic measurements. Discover how the Sloan Digital Sky Survey has contributed to mapping the Universe in three dimensions and detecting the acoustic peak. Investigate the cosmic distance scale, high-redshift mapping, and the detection of cosmic deceleration. Analyze the cosmological implications of these findings and explore the future of cosmic structure research in this comprehensive exploration of dark energy and cosmic sound. Read more