An international team of astronomers used the James Webb Space Telescope and gravitational lensing to characterize LAP1-B, an ultra-faint galaxy from 13 billion years ago. The study, published by Phys.org, revealed a record-breaking low oxygen abundance—merely 1/240th that of the Sun. This discovery marks a significant milestone in understanding the chemical evolution of the early cosmos.
LAP1-B belongs to a class of chemically primitive galaxies that represent some of the first stellar generations. Its extreme oxygen deficiency suggests it formed in a pristine environment, largely untouched by the heavy elements produced in subsequent supernovae. This makes it a unique laboratory for probing conditions just a few hundred million years after the Big Bang.
The measured oxygen ratio is the lowest ever documented, dwarfing previous records from similar studies. Such faint galaxies are notoriously difficult to observe, even with JWST's infrared capabilities. Gravitational lensing—where a massive foreground cluster magnifies the background object—was essential to achieve the required sensitivity.
These findings challenge models of early galactic enrichment by showing that some galaxies remained chemically primitive for longer than expected. This could reshape theories about when and how the first heavy elements spread through the universe. Future JWST programs are already targeting more lensed galaxies to expand the sample and verify whether such low abundances are common or rare.
Independent researchers note that while the oxygen level is remarkably low, confirming it in additional objects is needed to rule out observational biases. The result nonetheless highlights JWST's power to unlock the universe's earliest chemical history.