The cosmic microwave background is the luminous echo of the primordial explosion, the Big Bang — literally the oldest light in the Universe. Exquisitely precise measurements of this light have allowed astronomers to achieve what might seem impossible: weighing the universe, and thereby establishing the geometry of space. This lecture will explain the physics of the cosmic microwave background and the challenges in understanding where our universe came from.A lecture by Roberto Trotta, Visiting Professor of Cosmology 4 NovemberThe transcript and downloadable versions of the lecture are available from the Gresham College website: https://www.gresham.ac.uk/lectures-and-events/weighing-the-universeGresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. There are currently over 2,000 lectures free to access or download from the website.Website: http://www.gresham.ac.uk Twitter: http://twitter.com/GreshamCollege Facebook: https://www.facebook.com/greshamcollege Instagram: http://www.instagram.com/greshamcollege Support the show

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