The James Webb Space Telescope has observed a gravitationally lensed galaxy from 510 million years after the Big Bang, revealing insights into the early Universe's reionization process and the characteristics of the earliest galaxies. New James Webb Space Telescope (JWST) imaging and spectroscopy
Though little is known about galaxies at such early times, emission lines in the spectrum of this distant galaxy allowed the study’s authors to determine some of its physical properties. It is thought that the Universe was once opaque, dominated by dense neutral hydrogen filling intergalactic space.
Light from the earliest galaxies gradually reionized the majority of the gas in the intergalactic medium, transforming the Universe and making it transparent. However, the precise timeline of reionization and the relative contributions of the Universe’s earliest galaxies to this process remain uncertain.
Artist conception of the James Webb Space Telescope. Credit: NASA GSFC/CIL/Adriana Manrique Gutierrez Hayley Williams and colleagues report near-infrared imaging and spectroscopy observations, from JWST, of a distant galaxy magnified by gravitational lensing. The observed galaxy is located at9.5, corresponding to about 510 million years after the Big Bang and before reionization was complete.
Reference: “A magnified compact galaxy at redshift 9.51 with strong nebular emission lines” 13 April 2023,
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