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The Broken Cosmic Distance Ladder

*Watch Online/In person*: Measuring distances to astronomical objects outside our Galaxy is a surprisingly hard challenge: it wasn't until 1929 that Edwin Hubble obtained proof that Andromeda is indeed a galaxy in its own right. Today, astronomers extend distance measurements in the cosmos to the edge of the visible Universe, building up a 'cosmic distance ladder' made of several rungs. This talk will explore a major conundrum of contemporary astronomy: the distance ladder appears to be broken.

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Roberto Trotta is Visiting Gresham Professor of Cosmology and Professor of Astrostatistics at Imperial College, London. For more information about him, please visit his website:


Gresham College Barnard's Inn Hall Holborn EC1N 2HH

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