A natural gravitational lens—the Abell 2744 cluster—boosted JWST's ultra-deep observations and allowed the selection of a population of compact galaxies with an equivalent width of [OIII]+Hβ >740 Å. NIRSpec spectroscopy confirmed: their metallicity is 10–100 times lower than solar, dust is almost ab
arXiv:2606.05323v1 · 2026-06-03