Watch the Q&A session here: https://youtu.be/TRCkgDWKTdYMapping the stars is, perhaps, the oldest of astronomical pursuits, but it has been perfected by the European Space Agency's Gaia mission, which is providing an exquisitely precise map showing the positions and movements of the nearest two billion stars. Starting with a history of mapping the cosmos, this lecture describes the new and dynamic history of our Milky Way galaxy that results, and will move to explaining the dynamic and growing nature of our galaxy.This lecture was recorded by Chris Lintott on 26th February 2025 at Conway Hall, LondonChris is Gresham Professor of Astronomy.He is also a Professor of Astrophysics at the University of Oxford, and a Research Fellow at New College.The transcript of the lecture is available from the Gresham College website: https://www.gresham.ac.uk/watch-now/biggest-cosmic-mapGresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-todayWebsite:  https://gresham.ac.ukTwitter:  https://twitter.com/greshamcollegeFacebook: https://facebook.com/greshamcollegeInstagram: https://instagram.com/greshamcollegeSupport Us: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-todaySupport the show

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