Professor Meghan Gray discusses the immense galaxy cluster El Gordo (The Fat One), also known less catchily as ACT-CL J0102-4915. More links and info in full description ↓↓↓ Professor Gray: https://www.nottingham.ac.uk/physics/people/meghan.gray The Atacama Cosmology Telescope: ACT-CL J0102-4915 "El Gordo," a Massive Merging Cluster at Redshift 0.87 - https://ui.adsabs.harvard.edu/abs/2012ApJ...748....7M/abstract JWST's PEARLS: A new lens model for ACT-CL J0102−4915, "El Gordo," and the first red supergiant star at cosmological distances discovered by JWST - https://ui.adsabs.harvard.edu/abs/2023A%26A...672A...3D/abstract Weighing "El Gordo" with a precision scale - https://iopscience.iop.org/article/10.1088/0004-637X/785/1/20 Head-to-Toe Measurement of El Gordo: Improved Analysis of the Galaxy Cluster ACT-CL J0102–4915 with New Wide-field Hubble Space Telescope Imaging Data - https://iopscience.iop.org/article/10.3847/1538-4357/ac294f Messier Objects playlist: http://bit.ly/MessierObjects PERIODICVIDEOS (chemistry videos): null NUMBERPHILE (math videos) : null Astronomy at the University of Nottingham: https://www.nottingham.ac.uk/astronomy/ Twitter: https://twitter.com/DeepSkyVideos Facebook: http://www.facebook.com/DeepSkyVideos Back us on Patreon: https://www.patreon.com/deepskyvideos Video by Brady Haran and James Hennessy