From DeepSkyVideos.

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

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Video by Brady Haran and James Hennessy