Professor Meghan Gray discusses the immense galaxy cluster El Gordo (The Fat One), also known less catchily as ACTCL J01024915.
More links and info in full description ↓↓↓

Professor Gray: https://www.nottingham.ac.uk/physics/...

The Atacama Cosmology Telescope: ACTCL J01024915 "El Gordo," a Massive Merging Cluster at Redshift 0.87 https://ui.adsabs.harvard.edu/abs/201...

JWST's PEARLS: A new lens model for ACTCL J0102−4915, "El Gordo," and the first red supergiant star at cosmological distances discovered by JWST https://ui.adsabs.harvard.edu/abs/202...

Weighing "El Gordo" with a precision scale https://iopscience.iop.org/article/10...

HeadtoToe Measurement of El Gordo: Improved Analysis of the Galaxy Cluster ACTCL J0102–4915 with New Widefield Hubble Space Telescope Imaging Data https://iopscience.iop.org/article/10...

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Video by Brady Haran and James Hennessy