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Showing posts with the label cosmic dawn evolution

Webb Telescope Solves Cosmic Dawn's Bright Galaxy Mystery

The Shocking Discovery at the Edge of Time When the James Webb Space Telescope reached its permanent home at the Second Lagrange Point (L2) and began sending data back to Earth, it fundamentally disrupted established cosmological timelines. According to standard cold dark matter ($\Lambda$CDM) models, the early universe during the first 300 to 500 million years—a period known as the Cosmic Dawn—should have contained small, sparsely populated galaxies. These early stellar systems were supposed to be dim, slowly accumulating mass over billions of years. Instead, JWST identified galaxies at redshifts greater than $z = 10$ that were radiating immense amounts of ultraviolet and infrared light. To produce that much luminosity under standard assumptions, these early galaxies would need to hold as many stars as the modern Milky Way. Cultivating that much stellar mass so quickly seemed physically impossible based on the known speed of gravitational collapse and gas cooling in the infant uni...