Why Early Galaxies Shine So Bright: The Secret of Transparent Dust ⚡ экспресс
The James Webb Space Telescope has spotted distant galaxies (less than 0.5 billion years old) shining bright in ultraviolet, barely dimmed by dust despite loads of gas. Their dust comes from supernovae, semi-transparent like frosted glass, and porous—offering photons sneaky exit routes. With an opacity of ~10^3–10^4 cm²/g, the dimming is weak, which explains the link between mass and absorption and the excess UV brightness. Early dust simply hadn’t had time to build into a dense screen.
The JWST telescope has spotted a multitude of bright galaxies in the young universe. Their ultraviolet light was barely absorbed by cosmic dust — defying previous expectations. The secret is that in the cosmic dawn, dust was born in supernova explosions and was as transparent as a freshly cleaned window pane.
As galaxies age, dust grains clump together and grow, turning that clear screen into heavy curtains that smother light. That’s why ancient galaxies blaze so intensely — their light traveled freely through unclouded dust. Over time, the same dust becomes opaque, perfectly explaining observations without needing exotic theories.
🎯 Dust grains from supernovae are hundreds of times smaller than UV waves: light slips through them like water through a coarse sieve, meeting no resistance.