Spectra from the cosmic dawn obtained with JWST/NIRSpec (Space Telescope near-infrared spectroscopy) in the SMACS0723 Early Release Observations are now available. Analyses carried out by different teams indicate poor to extremely low oxygen metallicities (log (O/H) +12 0. 5, indicating high temperatures (> 105 K) in the emitting gas. Clear affinities are evident between the high-z galaxy spectra and those of local metal-poor galaxies at 0. 005 6 and z < 0. 05, whereas some cloud remnants of pristine galaxies survived and are now found embedded, for example, at 0. 005 < z < 0. 05. James Webb
M. Contini (Tue,) studied this question.