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Webb observed the galaxy cluster El Gordo, a “cosmic teenager” that existed 6.2 billion years after the big bang.
James Webb Space Telescope unveils the gravitationally warped galaxies of 'El Gordo'
Gravitational arcs in 'El Gordo' galaxy cluster
A massive blow for ΛCDM – the high redshift, mass, and collision velocity of the interacting galaxy cluster El Gordo contradicts concordance cosmology
